Will Your Engine Overheat Without a Thermostat?

[@jeffparkinson5005]

Minivan was seriously overheating, took the thermostat out 2 months ago, now it runs great, even on hot days and long drives, no more overheating issues at all, bought a red dot lazer thermometer early on to check the temp of the radiator hoses and the head and the block, normal engine temps around 200 degrees, the minivan now runs at a consistent 165-180 degrees.

[@user-us4yq8ec4i]

Is it still good?

[@Clearanceman2]

@@user-us4yq8ec4i Thing needed head gaskets I just bet. But I wonder how long you can go on this way. Supposedly for a long time if you don't need heat inside the car.

[@Cdmxforever]

I replaced the water pump, radiator, all hoses, antifreeze, and the thermostat and it was still overheating..... I removed the thermostat and no more problems.

[@alexanderhayden96]

​​@@Cdmxforever I immediately guessed the thermostat because I take care of my cooling systems in my Toyota sienna. 😂😂😂 Start small next time, even assume it's not a part and there is a piece of debris is stuck in your radiator or heater core!! It could be just that simple, understand that the smallest things can make or break a vehicle! I even had rod knock over a year ago in my van! I knew the previous owners didn't take care of oil changes on time, inspected the camshaft connection rod bearings when I disassembled the lower half of the engine while still inside the vehicle and had seen one bearing slip out of position and a few more were heavily overheated and scored by scratches, so I threw in brand new bearings on the connector rods to the crankshaft after I hand polished the crank bearing journals without and I repeat "WITHOUT" an engine tear down and it runs perfect! 😂 I would've needed a whole new engine! Now I just need to do the repair when needed! It's been over a year and no rod knock! As soon as I hear it again I'll change the bearings out once more! It's an easy job to do so from under the car too, next time just assume it's a smaller thing with a larger impact it almost always is on a vehicle!

[@Cdmxforever]

@alexanderhayden96 Good job man 👍🏻 I will consider all other possibilities next time!

[@QuantumLeap83]

People that think a thermostat delete will cause overheating want to say, 'It wOnT hAvE eNoUgH tImE iN yOuR rAdIaToR!" Guess what, It also won't have as much time in your engine block, either.

[@Platinumtag]

That true, it will eventually heat only only way prevent it from heat is to run a fan full time and delete thermostat… and have a water pump that flow well.. to keep a consistent temperature…

[@bottmar1]

@QuantumLeap83. I'm glad to see a comment with brain power behind it. These guys replying here don't seem to understand coolant, fast or slow moving, cycles more often, dissipating the same amount of heat in a given time frame.

[@wifeswapperbg7]

You also need to think about internal surface area of radiator vs eng. I'm not smart enough to figure that out.

[@ElmerPacheco-j9j]

WHAT ! 😮

[@Riklott1111]

“Yeah but it’s designed to work that way” They say that too

[@anilmaharjan3445]

I recently had my head gasket blown due to the faulty thermostat that caused the car to overheat. Had the thermostat removed and driving the car without it now. So far its running pretty good.

[@JacobApodaca]

I say no, every single car I’ve ever owned and I live in Los Angeles the first thing I do is rip the thermostat out , newest car I’ve had was a 2017 Hyundai sonata, my Uber car, and I pulled the thermostat out. oldest I’ve had 1984 Chevy K5 blazer diesel no thermostat, my 1992 Chevy 2500. I ran it for five years with no thermostat, hauled countless loads of tile, 2 tons at a time, and towed many trailers with dirt, bikes, and camping gear along with my truck being full never overheated, and it still has not given me any problems. In fact, it’s better for my vehicles. I don’t know why maybe the climate I’m just telling you my experience. My opinion when you close off the water flow that’s bad for the water pump because the water pump is working overtime to try and pump water through a closed system. If you remove that thermostat and open everything up, there’s no resistance and it saves your water pump and keeps the water free flowing now if you’re in a climate, that’s freezing cold or even blistering hot that’s where you’re gonna need a thermostat. Other vehicles I’ve done this with include, 98 accent, 88 and 92 Nissan hardbody,89 s10 pickup, 02 tundra, 02 accent, 92 FZR600r, 94 zxr750r, 07 fjr1300r , none of these ever gave me any overheating problems after removing the thermostat.

[@ElmerPacheco-j9j]

APPARENTLY NO ONE GAVE YOU ANY FEEDBACK ABOUT YOUR COMMENT BEING THE WRONG THING TO DO , SO YOU MUST KNOW WHAT YOU TALKING ABOUT , I HAVE A 2003 DODGE DURANGO ENGINE 4.7 OVERHEATING I AM THINKING OF TAKING OUT THE THURMASTAT AND SEE HOW IT WORKS OUT , WHAT DO YOU THINK ?

[@masonwhitley1496]

I was told to do the same but you have to put one in it bf it starts to get cold (if it does get below freezing where your at)​@user-ik2ll3fd4s

[@afshar6861]

I have subaru legacy outback1999 2.5 engine. When I put the thermostat my car overheating. But now I cut a older thermostat put on now car doesn't overheating. But with thermostat I can't get heat in dashboard

[@jesseg573]

@@ElmerPacheco-j9j how was it ?

[@dennisgrant4266]

Had so many vehicles overheat, I took thermostat out and no more problems.

[@cecegiles7753]

Dennis Grant thermostat gives false readings

[@klpaanyamina4361]

Yes, because thermostat is going to break or get lock or its gasket will break.

[@elpresidente3397]

A closed thermostat is dangerous .to many people Complaining there thermostat stays open and no heat . They can have my cars heat and keep it

[@rsdynotune]

@@klpaanyamina4361 Without a thermostat, heat will not be efficiently carried away to radiator and cause head gasket to fail sooner when driven hard.

[@Bleachanna]

An engine without a thermostat will develop extreme sludge and long term wear over time

[@Michael-zf7bj]

Thanks for clearing up the confusion. I have been losing coolant/water from the expansion overflow due to it boiling over when the engines hot. It was due to the thermostat being stuck closed. Told local garage and the guy told me to remove thermostat and leave it out he said it will run cooler? Fan still comes on and bike runs rich a week later. Gonna get a replacement right now!

[@angelothompson4614]

That was very clear and understood good explanation.

[@davidclough3951]

The only problems I ever had with thermostats, one stuck closed, another the middle section that opens and closes actually broke out somehow so it was just a restrictor hole for coolant flow.

[@ScatManAust]

Running an engine without a thermostat can make the engine run hot or overheat. Nearly all modern engines require the lower half of the thermostat to close the bypass and heater side of things as the engine gets up to temperature. If this port is not closed or restricted, a large amount of the coolant flow will not be pushed into the radiator for cooling. The water will recirculate within the engine getting hotter because the water is not forcefully flowing through the radiator. As a result the radiator will appear to be cool but the coolant within the engine can be high. You might have got away with that sort of hack 50 or more years ago with the very simple thermostats but not nowadays. I have also seen old systems without thermostats overheat on hot days because the coolant was simply flowing too fast through the radiator to cool properly. I used to modify radiator tanks with baffles to make the coolant pass through more of the radiator cores. And as far as thermostats controlling the engines coolant temperature, you are correct that it controls the minimum water temperature but it also regulates the flow of coolant of which controls the coolant temperature over a range of engine power output. The thermostat starts to open at the minimum temperature, it does not spring fully open. The thermostat modulates the flow of coolant through the cooling system and in turn keeps the temperature at a reasonably fixed temperature with varying power levels until the thermostat is fully open. When fully open, the temperature will continue to rise because cooling capacity limit has been reached and with more power comes more heat. The radiator has become heat soaked and unless more airflow or cooler ambient air or less power is commanded, the temperature will keep rising with more power. The whole system is engineered to be suitable for the vehicle it was designed for and any overheating issues means there is a problem with the system. If there is no problem with the cooling system, then it will be an engine or transmission problem or the vehicle has been modified or the vehicle is being operated outside the design parameters it was designed for. So, yes the thermostat does control the engine coolant temperature and is critical in making the engine run to comply with air emissions. A colder thermostat will make the normal running of the engine lower providing the heat can be removed by the radiator properly.

[@ScatManAust]

Also by running a cooler thermostat, you may make the engine run outside the control range of the power management system and cause unwanted behaviour

[@supplykayo3049]

Thank Youuuuuuu, I appreciate this and the time you dedicated for us all to hear. VERY IMPORTANT INFORMATION.

[@ScrubyMcBubble]

This might be my cars problem.. i did multiple combustion leak/block test and it was negative. Did compression tests and they were great.. i have a fairly new radiator.. and yet ever since I had the water pump changed my reservoir overflows. When the water pump originally failed I had removed the thermostat for testing purposes and never reinstalled it lol I'll update if that was my problem.

[@robertjahrling1877]

How did you mod the R-Tank. If you dont mind. You see I live in Florida and since I was a teenager I had been discarding the thermostat but you're right I would not do that I'm one of these newer vehicles I do however have an older vehicle without one Bell or one whistle everything manual "everything" When I was younger on one of my older vehicles I went as far as adding or extra radiato in the bed

[@ScatManAust]

@@robertjahrling1877 G'day Robert, The radiator tanks were removed from the core and I used to manufacture brass baffles to the same inside section of the upper and lower tanks and solder them in to the tanks. I would generally divide the core into thirds or quarters depending on the job. I would set them up so that the first baffle was placed 1/3 or 1/4 of the top radiator tank so the coolant would pass through the 1st section of the tank and then be pushed through to the lower tank. Then I would put another baffle in the lower tank 1/3 or 1/4 along the lower tank so the coolant would be pushed through the next section of the core and repeat this process . The end result is the coolant will be pushed through 100% of the core forcefully and rapidly cooling down with each pass. This is a Superior way of making the available surface area and capacity of the radiator more effective. A std radiator configuration will push most of the coolant through the first 1/3 to 1/2 of the top tank and the rest of the radiator will not be as efficient as it could be . This mod I used to do was mainly for industrial and stationary engines , gensets and drill rigs in out in the Australian out back where temperatures exceed 45 deg for months at a time. I also used to do a lot of 4x4's especially after they have had major power enhancements or engine swaps. It was a great mod for 4x4's that had these changes and could not install larger radiators because of space and or aesthetics constraints.

[@joshuamoore24_7]

I used to own a 1979 Oldsmobile Cutlass Calais 5.0 V8 and it blew a heater hose the third day I had the car operating. I replaced the hose clamps with screw style clamps, the hoses to high performance heater hoses. When I went to swap the radiator hoses I checked and there no thermostat. So I installed a 190°f thermostat. The car never overheated and boiled over again. The coolant before and after the repairs was brand new.

[@DEANYoungsATB]

Same thing happened to me on an 97 Oldsmobile aurora

[@chevota400]

Hoses were short lived on older cars like that, and a normal maintenance item due to the very short life span. If the hose were good, how could it blow due to heat unless your radiator cap did not vent? Very rare that a cap doesn't vent, so I'm going with hose failed because it was past due, and nothing to do with the stat. In a similar universe: A guy gets a flat tire, and while buying new tires he notices the lug nuts are all rusty! He buys new lug nuts and hasn't has a flat since. Later, goes on youtube and announces his findings.

[@gustavofacundo3282]

Bought a ford taurus 2013 that after a couple of days of driving started to overheat and continued doing it at times intermittently over a week period,so i decided to check the thermostat and found that it had been removed so i replaced it also put some new coolant and it's been working fine so far,no heating...

[@chevota400]

Perhaps it had a bypass, and with no stat the bypass was open. In those cases you need to block the bypass when removing the stat, which is a given, but some people are unaware.

[@mbsnyderc]

If your overheating on a stock engine the thermostat could cause it if it's not opening or not all the way open but usually you have an other problem like air in the system or a blockage in the coolant system.

[@joyfuljeff9128]

Any liquid-cooled car engine has a small device called the thermostat that sits between the engine and the radiator. The thermostat in most vehicles are about 2 inches (5 cm) in diameter. Its job is to block the flow of coolant to the radiator until the engine has warmed up. Once the engine reaches its operating temperature (generally about 200 degrees F, 95 degrees C), the thermostat opens. By letting the thermostat open, it lets the antifreeze flow back into the radiator as the cooler antifreeze goes into the block to keep it cool. The thermostat reduces engine wear, deposits and emissions.

[@mbsnyderc]

@@joyfuljeff9128 who are you talking to?

[@ALWOOD_USA]

Instead of closed or open, can a thermostat be slow to open? And it's intermittent. Sometimes from a cold start it will warm to almost red before dropping back down to the mid mark - then its fine till the next cold start. I've had to pull over and stop twice to let it cool off.

[@nathanbuck929]

I disagree on a couple of points. I feel this is oversimplified. Thermostats do restrict fluid flow even when full open. Coolant temperature depends on multiple things, not just the thermostat. The amount of air across the radiator has a great deal to do with coolant temperature reentering the engine. If there is adequate airflow and proper coolant flow, a 160 degree thermostat will maintain that temperature regardless of engine load.

[@abdulhassan1107]

Only there's a reason why the manufacturer's engineers chose a higher temperature thermostat, while there's no cost saving involved. I've heard many opinions but that point made a lot of sense to me.

[@lindaleehulsey3167]

Can you tell if your thermastat is closed taking it out of the housing? To be sure it is stuck? B4 cost invested in somewhere you do not have to spent? 1. New thermastat 2. Radiator 3. Water pump leak new gasket 4. Fan clutch Do what 1st. If engine gets hot idling then chug a lugs & dies.....to hot after a few minutes idling.

[@criscalderon8508]

On my chevy 350 i dont have a thermostat, but i do have a 2 row aluminum radiator, one 16 inch electric fan with a switch and no fan clutch , so the fan spins with the motor... Will i still over heat??? (Not a daily driver) weekend car only. I do have a electric fan & mechanical together.

[@AraceaeFanatics]

Thermostats also get stuck closed. We're experiencing a new thermostat that opens later than the stock one, and the car starts to overheat before it does open. The thermostat does control coolant flow through the radiator and if it's staying closed, it's not being cooled down in time to cool the engine before the coolant begins to boil and escapes via the overflow.

[@jakek9371]

Thanks very good explanation. Have you or do you know anybody who has modified thermostat.

[@alialwahaibi1234]

The Jeep JK OEM thermostat opens at 95 celsius while most of them in my country are operating at engine temperature above that, if you go up hill or offroad the heat will increase so we remove the thermostat which keeps the temperature stable and never over heats.

[@johnwhodat8135]

First start of eng in the morning (chevy Express 1500 cargo van ) it reads eng hot and wont allow a/c to work. Thermostat stuck in open or closed position?

[@somanynamesilltrythis0180]

Does the thermostat have anything to do with the amount of pressure in the cooling system? Both coolant lines on my 03 Impala (3.8l) seem to have more pressure building up during normal operating temperature.

[@JamesPiccone]

My truck ran hot with no thermostat & took forever to warm up,ran perfect with one in 🤔. it's not water cooling the engine it's a glycol type which needs dwell time to transfer the heat👍. If flow rate is too high it does not efficiently pull the heat out as designed.

[@chadnauman6581]

Your truck worked better with a thermostat because it forces the coolant to go through the radiator rather than the bypass. So you actually had higher flow through the radiator.

[@TheAndriyan]

That's it, 2 bar 1 litre vs 1 bar 1 litre in heat exchanger effect. Like refrigerator system. So much misinformation on internet. 🤔

[@nicholaslandolina]

Causes water to boil out

[@sweetwilliam49]

Exactly water needs to be contained in the radiator to be cooled. On hot days water doesn’t have time to cool before it’s reintroduced back into the engine, causing overheating

[@monster6331]

@@sweetwilliam49 yo I'm in the Bahamas where it's always hot. I own a 2009 Nissan Bluebird sylphy n I blew a radiator due to a closed thermostat. I removed both the thermostats n replaced radiator. Lol I'm here because that sh#t overheats in minutes. 😂😂 I'll be installing new ones back in tomorrow

[@paulthompson1654]

High at 3.07 certain vehicles operate very small radiators and will overheat when thermostat is removed . Why coolant flows to fast past cooling tubes . Cooling is functioning of pulley ratio // radiator fan // radiator size // water pump impellor design /// optional thermostat flow restriction //

[@THETHINKINGMINDS]

Thank you sir, very useful information. It clarified some myths. Thanks again.

[@emmettturner9452]

My thermostat was stuck open and the engine was over-cool for at least a year of daily driving (the time I’ve had it). The temp stayed all the way down unless I stopped and idled for 10-20 minutes and even then it would shoot back down almost as soon as I started moving.

[@Borneotek]

great input, running the engine without a thermostat is the better choice in warm climate places...

[@tylerbuilt_chevy_tough5163]

I have a 89 k1500 350. It did good with 195 oem thermo last summer then winter came around and the temp was bouncing off 230 not okay with me so I replaced thermo no fix then water pump then radiator then coolant temp sensors then got system flushed I don't think it's cracked head oil and coolant always looks good nothing comes out of the exhaust bad. I finally gave in and tried a 160 thermo then I ran 190 rest of the winter now that summer is here it's creeping on 230 again. So I just tried a 195 thermo thought well that did good last summer maybe it'll work this summer. Well now the 195 makes it worse. So now I'm left with running no thermo and see what it does any help or advice be appreciated I'm at a loss at this point I'm confused

[@tylerbuilt_chevy_tough5163]

Figured out it needed a auto meter brand name temp gauge zero problems now

[@DEANYoungsATB]

I have a 1997 Okdsmobile Aurora that was overheating badly. I went to replace the thermostat and found there was none. So i put a thermostat in and it has not overheated since

[@MichaelSellmann]

My thermostat is showing bad and engine light is on. Can I drive it like 140 miles to the mechanic with out overheating or shutting down. It's a 2018 Grand Cherokee Laredo

[@KennethBostonian]

Where can I find the women driving the Porsche ad commercial. I was watching and lost it lol. She said she was from CT. I found her, I was watching your videos, and this played Going Home with Bozoma Saint John. She’s the CMO/ chief marketing officer at NetFlix . Keep up the good work. The thermostat video was awesome. I’ll pass your video around.

[@dannypower1319]

Engine heating up not loosing water or coolant I just done water pump and it’s heating up quicker 2004 tekcuchi mini digger thermostat is out of it ?

[@marshascott5995]

Hi, ur video is short sweet and straight to the point. Thanks I've got a new follower

[@MalloryHasCats]

Good God why is the opening like 200db louder than the actual video?

[@joseortega1114]

My dad's 1992 Nissan pathfinder XE is not overheating and it doesn't have a thermostat either

[@ryanmcdaniel4727]

Did you not watch the whole video? Your dads car won't over heat if he dosen't have one, but it will run less effectively (mostly because all gas engines need a little bit of combustion help other than a spark plug), if there is no thermostat you will spend more money on fuel because it takes more stress in the cylinders to get the engine up to its general operating temperature. Engines run better at certain temperatures with certain amount of gas to air ratios. Cold weather needs a different fuel to air mixture than warm weather does. The thermostat will not effect the engines running temperature, but the engines running temperature will effect the wear and tear or fuel economy of the engine. If you live in a southern state, like tx, no big deal if you pull it out. Minnesota in the winter? The engine engine has a hard time getting the right fuel to air ratio.

[@Benko_DieseL]

if i would enable the thermostat to be open always,would my engine be always cold and would it be bad for the engine?

[@C5Z06CarGuy]

No it wouldn't always be cold, but it would take longer to reach operating temp, which would be bad for your engine. Most cylinder wall wear happens with coolant temps below 170.

[@enriquebarrera989]

Can anyone tell me why I over heat with a thermostat and run normal temp without one?

[@danrose3233]

The thermostat when open restricts flow compared to having no thermostat. Higher flow provides more cooling. It is amazing how many people have this concept backwards. They think the water needs to stay in the engine longer to "absorb" heat. This is absolutely not true.

[@Clearanceman2]

I have an subaru that is blowing exhaust out of the head gaskets into the coolant and it overheats right away. But there is no heat in the car. Person told me pull the thermostat the car is overheating before the thermostat can open. He said I won't have heat inside the car but the car won't overheat from the exhaust gases.

[@iBeDatSwaggaKing]

So question is it ok to take out my thermostat for just a few days? I have a 2011 Camaro lt. my fan works but my cat is running hot

[@Platinumtag]

Take it out, will increase power as when engine running cooler it fire more and have your fans run full time.. that the best thing if u want to race. Vehicle won’t overhead which equal to run race all day and safer for your gasket

[@rubenproost2552]

I took the thermostat out of an overheated car that I bought for almost nothing hoping it was just that. It wasn't. The head gasket had blown and the head warped, likely from this completely closed thermostat, but without it I could almost make it home. Had I not taken it out, I would have stranded within 10 minutes. Roadside assistance got me the last 10 miles.

[@haryatnoam1139]

In the hot climate country, OK for thermostat removal since electric cooling fan is always on assisting cooling process. Thermostat removal to be follow by plugging the bypass line, if not then 50% coolant flow through radiator and other 50% through bypass line. This the common mistake for just remove the thermostat.

[@denesdolor975]

i live in Middle east with ambient temp of about 35 degreees centigrade, is it possible to remove the thermostat?

[@Mr7352]

Thank you for video ..helps alot to understand how and why thermostat is important. Question if cooling fan not working ,already changed sensor switch and fuses not working still only when A.C is on what do you think would be next step? Thank you for help.Keep up the good work.

[@Ian-of9oi]

I’ve got an old rig with an Olds 403. Put in a thermostat and it runs hot. Pull it out and it runs good on warm days but too cold on cool days. I think I need a water pump. Thermostat causes a slight restriction.

[@matejhosner1980]

Put a piece of cartboard over 1/3 of the radiator ;)

[@mantimemlojwa4622]

The heat gauge of the vecihle keeps going up, however the engine remains cool, i dont know what to do now

[@betod3113]

Today I was sitting on horrible 1 hour traffic and later but everything was alright until later when and I noticed my car was about to over Heat so I pulled over turn it off for 30mins and I checked my car and it was even hot how weird then waited a bite then turned it back and the level went back how its supposed to be.. Then I drove it normally..

[@s_ame1135]

Stuck on traffic means no wind coming in from the front and the radiator won't cool. Your fan might not be working properly or your radiator is clogged.

[@NhlakaniphoDube]

Does a thermostat help you with the cold start

[@Mr7352]

so if my 2001 toyota camry .that i replace three fan sensors and fan switch still no fan kick on so put on manual toggle on all the time now but still temperature getting hot. head gasket good fresh new coolant..and i took off thermostat. still getting hot. coolant is flowing ,i dont understand. can you help..before i have to take to shop..Thanks for videos..they help alot.

[@emekaifemenam7703]

Someone pls reply this. Thank you so much

[@MazdaRX7007]

Maybe its the coolant pump?

[@jgmopar]

I tried this with an old car 70's old. with no thermostat it ran cooler for a while but when it got hotter it could not cool down. with the Thermostat 180 deg. it always stayed at 180. I believe without the thermostat the radiator didn't have enough time to cool the coolant in the system when it got to the 180 threshold. It just continued to get hotter. it did stay cool for a long time before it got bad. So i always run a thermostat

[@bottmar1]

@jgmopar. Wrong. Faster moving coolant picks less heat in the engine too but returns sooner for more heat. The same with the radiator. Faster moving coolant returns sooner to dissipate heat again. Coolant speed, slow or fast, over all, removes the same total amount of heat in given amount of time. Also coolant flowing so fast that it creates a space or vacuum between the coolant and metal surfaces caused by speed is highly unlikely especially in a pressurized environment. The coolant would have to be traveling at an extreme speed.

[@joltjolt5060]

​@@bottmar1so, you would say to remove it in hot climates?

[@braqwekulyrics7286]

I have a question that I haven't received any better answer on it from mechanics. The question is, my radiator fan works perfectly when I take the thermostat out and when I put it back, the fan doesn't work anymore and my temperature rises to overheat when I'm driving slow(when I'm in traffic) The temperature starts to drop when I'm speeding because the air outside blows the radiator fan to rotate so it cools the system. Even though I want to take the thermostat out, I honestly want to know why this is happening because it wasn't like this when I first bought the car. All started happening after an accident

[@omerhassansharif6891]

what about hot countries like sudan the temberature is som e times over 40. thanks?

[@tickyul]

My van gets 12.5 mpg with a thermostat in and 12.0 mpg with no thermostat...........that is about the only difference. Well, of course with no t-stat, it runs much cooler and I have no passenger-heat.

[@TommTooTone]

Computer doesn't like what you did and the fuel injectors are treating it like a cold motor putting more gas into it. Same thing can happen if you widen your spark plug gap the computer will tell it more fuel. I hate computers that's why I drive a 72 without a thermostat

[@kumara5492]

@@TommTooTone You are damn right. I drive Toyota Prius hybrid , but , I like non hybrid more these days , especially after ( still ) dealing with overheat problem. Modern cars got too complicated for not much benefit.. I am about to pull the metal or spring in thermostat housing , to put an end to overheating. I rather deal with other problem that comes without thermostat.

[@phillyhank8726]

Hello, my question is… my son traded his 04 F150 for a Honda Civic. He has it for about 4 days before it began overheating. We figured let’s start by checking the thermostat. So I go to swap it out, I get the thermostat housing off and “voila” there was no thermostat in there at all. Swapped it out drive around for a good while and so far engine temp has been in the middle of the gauge. Why would anyone remove the thrmstt.

[@christiancastaneda3967]

This video answered all my questions, awesome!

[@JMakesWell]

Good video. But there’s an option c to address which is a stuck thermostat leading to extreme pressure buildup , which greatly increases both engine temperature and will likely blow out gaskets and hoses. Running without a thermostat temporarily is okay while you’re waiting to replace it .

[@michaell3711]

I have been running my Honda Accord (97) without Thermostat for 5+ years now. No overheating. But please avoid doing this in cars made after 2010.

[@TamImBlessed]

@@michaell3711 Did your Accord consume more fuel when you removed the t start? Someone made mention of higher fuel consumption without a t stat but I’m not sure if that is true. My t start got issues so I removed it completely then set the fans to role immediately after starting the engine. By the way I use Honda Civic 05/06.

[@tendosan8539]

@@TamImBlessed i have civic 04 and coz overheating and i think the thermostat is close coz even not in traffc the temp gauge wont drop

[@fistonndongalo139]

My coolant light been coming on the dashboard on and off .... firstly the mechanic said the problem might be the sensor or the thermostat and I got them all replaced but still the light keeps on coming on and off and it’s even worst now.... please any advice 🙏🏾

[@jayislander]

Update

[@joltjolt5060]

I'm a woman and the first thing I always do is get a new radiator cap. Cheap, can't hurt.

[@hillsider1200]

So I had my radiator replaced after that start to over heat thought maybe I need a new thermostat bought a new one and I still can’t get right temperature with new thermostat or get to stay at 210 so I went an head an took the thermostat out and getting water flow to block now temperature is back to normal but with new thermostat still over heating any ideas ???

[@MrBob2212]

Same thing literally just happened to me and the mechanic couldn’t figure it out.. I had my water pump, tstat, radiator, upper&lower hoses all replaced and nothing would stop my truck from over heating at idle’s only besides removing the tstat completely. :(

[@hillsider1200]

So I figured it out and I have a valve that u have to loosen to get air out of the block

[@musicman7886]

@@hillsider1200 Hallo , and which valve is it? Thanks .

[@hillsider1200]

musicman 78 it’s a value to bleed to coolant system let’s the air out of the system

[@finddreamsstudios]

Thanks man. This is what i wanted to hear

[@yesyrodriguez2388]

I took off my thermostat on my Jeep Cherokee and it don't heat up no more.. We are in cold weather right now now the check engine light came out and it says check gauges and the temperature one it stays at low the whole time and it makes this noise in the engine like it needs air or something like forced to drive sound?

[@LH81633]

YESY RODRIGUEZ if your vehicle is overheating with it in!! Then you have a problem!!! Weak water pump! Leak/, in whipping hole gasket radiator!!! Cussing air into your system, try blue devil!! Gauge will stay at low because fluid is staying cool engine isn’t meeting temp and temp sensor is sending mix signals to pcm!! The noise!! Is your water pump gone bad!!!

[@richlenmensah4227]

Thanks bro, your explanation was perfect

[@FajaRathalos]

but it work with my e30 m40, suddenly overheat just like a broken thermostat or weak viscos, change new radiator, new water pump, new viscos and new electric fan, but still overheat, never thought its because im not using thermostat but when i put a new thermostat in it its all good just like that, still dont get it till now

[@sowardsfamily2369]

Your thermostat can also stick closed which means it never allows apporpriate coolant to circulate.

[@HARDEEPJADEJA]

Hi, can you suggest any thing to keep freelander 1 2001 petrol 1.8 ltr cool ??

[@tomkarlsborn2384]

I had a Mercedes 300TE (3L straight 6 cyl) which needed a new waterpump because of leaking seals. It never overheated even on hot days in the tropics. I had the waterpump replaced and had a horrendous overheat problem within 20 minutes of driving. This problem was caused by the mechanic removing my perfectly working thermostat. So YES! It can cause overheat. The reason was no water back pressure at the thermostat which severely reduced water flow to the rear cylinders which caused coolant there to boil and dump the coolant out the radiator cap! A new thermostat fixed this immediately. However one year later my head gasket failed due to this. Some engines need the thermostat in for normal ops and be very cautious about running without it. Other engines are ok.

[@davidmcghee7696]

Chevy big blocks have the same issue on the rear 7 8 cylinders. The by pass port helps them stay cool.

[@joyfuljeff9128]

Any liquid-cooled car engine has a small device called the thermostat that sits between the engine and the radiator. The thermostat in most vehicles are about 2 inches (5 cm) in diameter. Its job is to block the flow of coolant to the radiator until the engine has warmed up. Once the engine reaches its operating temperature (generally about 200 degrees F, 95 degrees C), the thermostat opens. By letting the thermostat open, it lets the antifreeze flow back into the radiator as the cooler antifreeze goes into the block to keep it cool. The thermostat reduces engine wear, deposits and emissions. Different vehicle does not have a thermostat the antifreeze overflow and heat up in the radiator and block. 🤔

[@rubenproost2552]

Interesting. But what good mechanic takes out a thermostat and not replace it. Sloppy.

[@chevota400]

My guess is it needed a plug for the now open bypass. If so, and a bypass plug been installed, you would've never known and maybe never blew that gasket. I have to say I've never heard the back pressure theory before, and I've a lot of bs car stories. The only scenario where I see a real need for a stat is cold weather where the eng can't warm up and you're freezing your butt off inside and the glass won't de-fog. Generally it's only people in hot areas that remove the stat, because it often causes or contributes to overheating.

[@chevota400]

@@rubenproost2552 My guess is he tossed it on purpose but still charged the customer. Of course all mechs are 100% honest so that could never happen.

[@monster6331]

Ran my 2009 Nissan Bluebird Sylphy without both thermostats it overheated in about 20 to 30 mins of driving n has extreme head pressure when removing radiator cap.

[@jayislander]

Update

[@cardetailingguru7258]

Just took off mine and everything works perfect and no issues

[@cecegiles7753]

car detailing Guru same here

[@FinsleysCustomCarAudio]

I been driving without t-stat (cut the center out of it out so it maintains restriction) for a few years now in a 2010 impala with zero problems. Only takes a few more minutes to warm up. Also did this on older 350’s on the farm with zero overheating issues.

[@elpresidente3397]

My car has 406000 miles and it's starting to overheat good by thermostat.

[@elpresidente3397]

I am going to try to suck 6 months out of it winter and rain is coming

[@Bleachanna]

@@FinsleysCustomCarAudio taking the thermostat out will cause extreme long term sludge build up and wear.

[@robertcouse3961]

the thermostat is a flow regulator to maintain temp. take out and coolant circulates to fast to cool down in radiator.

[@DavidUKesb]

That's what I thought too. And if that's correct, then the fella in the video is incorrect on that point.

[@C5Z06CarGuy]

That's a myth. Think about what happens when your engine is at higher rpms. The waterpump turns faster, increasing the speed at which coolant flows, in turn increasing cooling efficiency.

[@brandonwells6527]

Partly true, some cars will over heat, some will run cold.

[@berreilnompilo6581]

Thermostat function is to maintain engine operating temperature preventing it from running cold or too hot by sensing temperature differences at any time opening and closing coolant flow in and out of engine allowing radiation and temperature buid up accordingly.

[@bottmar1]

Bull shit. Fast moving coolant cycles more often. It's in the both engine and radiator less time. Without the thermostat to bypass the flow, back to the engine, it will run cooler unless there is another problem that can cause over heating. Radiators are designed to be capable to over cool an engine. There needs to be a little more common sense in these replies on this video.

[@happyfox711]

Will the flow rate have any effect on the efficiency of the cooling that happens in the radiator?

[@sweetwilliam49]

A higher temperature thermostat causes water to stay in the radiator longer, cooling the water in the radiator to a lower temp but the water in the engine will run a little hotter. Your heat gushed will show higher temp that engine is operating at. As far as flow rate I don’t think it would change much

[@danrose3233]

Higher flow=more cooling.

[@CONRADOABRAHAM-br8tk]

Thank you for the definitive answer. Great🎉

[@Demufao]

Much of educational comments thanks guys.have my Subaru legacy that recently had head gaskets replaced and removal of the thermostat after its does 3000 k start overheating again like 20 min drive,after all the headless chicken run out of ideas I decided to open the rad was completely blocked of dirty so I got it cleaned and install new thermostat but still overheating down pipe stay really cold even I do 120km/h ..did research as much to find it be a stuck close thermostat so today will remove it and see what happens..I thank you guys for the info never ever read more that 50 but to this It's more than..all the way from Namibia

[@grantdevon]

How did it turn out?

[@yankees8690]

My car start overheat in lyk 30mins of drive wat could be the reason . The fan goes on and wen I pulled over to cool in next mins it's be fine idk wat happen to car. help me

[@thebookpicker8506]

Bad thermostat

[@yadavfamily6263]

Hi i have chevrolet captiva some days before running car 15km without coolent and water after some days car ty to start but car dont turn on bcz temrature light turn on dear all what i do now

[@armandoalejandro7209]

What if my Civic is still over heating without thermostat and fans blowing

[@joelcagampang2566]

so if we remove thermostat is it ok to the engine to work?

[@Thegoldenemerald]

I’ve never had fans turn on must mean every thing is ok never had over heating issues either

[@joseluisreynoso4848]

If you remove the thermostat, what do you put in its place?

[@felipemolina8424]

The same thermostat you just leave it open by cutting the coil

[@Borneotek]

that entirely depends on the climate of your location, if you're driving in warm and tropical climate places then you dont really need the thermostat because the coolant temperature is constantly fix on the optimal running temp level, but if you're driving in colder climate and snow then you definitely need the thermostat in order for the coolant to melt in radiator before going in to engine...

[@WalterRobles]

But hear me out, I own a Ford fiesta made on Brazil (and other places) here in Guatemala, parts are really hard to get because the official dealership has only parts for US fords (the ones they sell) and really hard to get from other places, so for me I think my best option is to run without one cuz they fail constantly in this model. What do you think?

[@nashvilleoutlaw]

Idk.. I had a 400 sbc in a car that started getting hot with about 10min of driving. So I pulled the thermostat and tried running it without it and couldn't even make it to the end of my road without the light coming on. Put a new thermostat in and it never overheated again...

[@realLoveDone]

I change my thermostat because it wasn’t opening and the new one started doing the same a few weeks after installing it…

[@realLoveDone]

Turns out it was just my clogged radiator

[@ralphwood8818]

Had a Ford 4 cylinder about 84 Escort. 2 cylinders weren't getting enough coolant. Warped and cracked head. The fix was the replacement head gasket restricted the flow making the coolant spread out and cool all 4 cylinders.

[@narsisomendosa]

Not true at all removing the thermostat will cause some overheating on cars since all the hot water will just flow around the thermostat controls that

[@Earth_By_Board]

TheOffroadGuy oh shut up

[@davidrae58]

TheOffroadGUy is right though

[@FinsleysCustomCarAudio]

I been driving without t-stat (cut the center out of it out so it maintains restriction) for a few years now in a 2010 impala with zero problems. Only takes a few more minutes to warm up. Also did this on older 350’s on the farm with zero overheating issues. Guess I’m just lucky.

[@gonzaloaguilar361]

Great video! very well explained.

[@kenwilliamson7715]

Tried a lower temp stat and temp guage is much lower all the time.....bought a higher temp one now its just right.

[@Platinumtag]

When a engine is cold it move faster than when its hot.....a hot engine won't even start.....but with or without thermostat a engine alway reach its operating temperature nothing will stop that and without thermost you much safer from overheating in the future...

[@Kaeden-z8n]

We’ll the thermostat also restricts flow so the coolant can absorb heat. If you have no thermostat the coolant won’t have enough time to absorb the heat from the engine and therefore on long drives you will overheat

[@mohameddada2580]

My nissan tiida dosen't have a thermostat but the vehicle is overheating. Replace head gasket o,hauled cylinder head. Whats going on.

[@s_ame1135]

Always check all of these when overheating : water hoses leak, clogged radiator, fan, water pump, and thermostat. Engine overhauling should be the last thing you check since it's the most expensive.

[@balsonnaoshekpam5680]

Thanks.... Plz tell me why my car is not stating after overheating

[@chrisbcream3748]

Check your oil to see if it looks milky. You could have warped/cracked the head or block. Compression test helps as wel

[@mylarson7640]

2013 Ram 2500 stock 205-210 degrees with 180 thermostat 183 all the time .. In Georgia heat.

[@DrOlegKulikov]

So, in warm climate like in Thailand with +36C daytime, who needs a thermostat? The thermostat is for cold weather only to heat air inside a cabine. But if we always keep air-conditioning, why we need it? No, we don't.

[@3point8]

It's not necessarily only for cold environments, as i say in the video, it's intended to help the engine get up to the correct operating temperature as quickly as possible.

[@DrOlegKulikov]

@@3point8 Somehow I see higher fuel consumption without the thermostat till time when the engine gets hot. A result of rich fuel mixture by an electronic system with direct fuel ingection?

[@3point8]

@@DrOlegKulikov Correct, there is typically fuel enrichment until the coolant reaches operating temperatures.

[@ZulkSOD]

will it damage the engine? my thermostat has been stuck open for about 6 months and wondering if its doing any damage

[@Mr_Bones.]

OP pro Yes, and you’re going to waste WAYYYYY more gas than you’re supposed to. Here’s my personal example, I have a 2003 Honda VFR800. The thermostat is stuck open. I’m supposed to get 38-44 MPG, I’m actually getting 24-27 MPG. I’m filling up twice as often as I’m supposed to and because I’m running rich, it’s going to foul my expensive spark plugs. It’s sitting now while I wait for the part to come in 😭

[@BillyHillShow]

I was gonna go buy a vehicle four hours away and its got a bad theromstate on it I cant fix it until I get it home, is it worth it or should I pass on it?

[@Mr_Bones.]

Billy Hill Show Depends, if it’s ONLY the thermostat, it should be pretty easy on a car. Discount the cost of repair a DEALER (not a small shop) would charge from the car though. You might want a professional to look at it though before buying. Hire a mechanic to inspect it. $100 might save you from a $3,000 headache

[@BillyHillShow]

@@Mr_Bones. if it all checks out I gotta drive it 4 hours to get back home is that bad?

[@keating15]

buy it @@BillyHillShow

[@tiffanysellers5372]

Replaced the thermostat, two different ones. Still was boiling in the reservoir. It runs fine with no thermostat. What could it be?

[@joncrawford5741]

Be sure the thermostat u installed isn't upside down. Overheating Ford truck. Checked Stat. Installed upside down.

[@MrNorotic]

Blown head gasket, clogged radiator or bad water pump. Also, make sure fans working

[@jrm163]

Good explanation!

[@158mollie]

What do you think about an order ATV do I need a thermostat

[@floridamansgarage8629]

not at all just make sure the radiator fans blows good

[@TonyMiller-u1v]

Thanks for the info 👍

[@davejohnson4472]

Why do they sell different temperature thermostats if it doesn't make a difference

[@steveh7085]

I have to add my input on this and I believe that running without a thermostat is a bad idea because number one the water is just going to pass through the engine to quickly without absorbing the heat like it’s meant to in other words it can create hotspots in the cylinder head without reflecting on the overall coolant temperature so in my opinion it is a bad idea to run without a thermostat or some sort of Restriction at the minimum. Also it is a bad idea to block off bypass ports because those are needed for correct thermostat operation to have some water circulation while the thermostat is closed Removing thermostat may allow the engine to run slightly cooler but that all depends on the cooling capacity of the radiator let’s say for instance do you normally run a 190 thermostat and your car runs at 210° well removing thermostat isn’t going to change anything it’s just going to take longer to warm up but it’s still going to run at 210° but if you were able to add let’s say a second radiator you’re going to increase your cooling capacity so it could in theory run at I don’t know 160° but like the guy said thermostat allows you to run at only minimum temperature.

[@melodyblocks2905]

Exactly right. These people believe a lower temp thermostat can magically bring the engine temp down just because it opens earlier. That's some bad logic. the opening temperature is ultimately irrelevant if the engine reaches normal temps. That's like thinking that on a carnival ride, lowering the "you must be this tall" sign's arrow, will make tall people shorter. It's just as ridiculous. for a thermostat to have an effect, like you mention, the engine must suffer from overcooling, not overheating.

[@benjamincharumbira1771]

the hose harden but temperature gauge will be at operational temperature .is this okay

[@tchrisou812]

Replace the hose, hardening is a precursor to leaking.

[@mike-bj4dk]

i just hope people read the comments and yes removing the thermostat can make it overheat like sitting in traffic with ac on i know because my truck just done this decided to replace thermostat now all is good. so 100 percent it can cause an overheat problem nothing is restricting flow long enough to get rid of the heat.

[@Michael-qy1jz]

??? If I restrict the flow in the radiator another 30 seconds let's say, to let the radiator temps cool down, then I'm increasing the heat in the heads/combustion chambers??

[@sweatshirtman8179]

Where can i buy one for my bk2 3.8 genesis coupe?? Definitely dont want it overheatin

[@DL-qq4nu]

3.8s are notoriously difficult to do thermostat on Its a 6-7 hour job on a 3.8 borrego

[@JD-wx3pk]

I just want to shed some light on my experience with thermostats. My preference is to remove the thermostat in the summer and put it back in for winter. If you have an older vehicle with fairly high mileage, the last thing you want is the risk of it overheating due to a faulty thermostat. Thermostats don't last forever and you can buy a brand new thermostat and have it fail on you. So a word of caution, if you buy a new thermostat, make sure you test it first before installation. Your vehicle is going to heat up irrespective of if you have a thermostat or not, so why restrict the flow of coolant running through your engine and radiator etc.. especially in Summer!. I've had so many problems with thermostats it's not funny. I've spent lots of money repairing vehicles all because the thermostat f..ked out. Also make sure you have the correct radiator cap, if it f..ks out, you're in trouble. If your old radiator cap works fine, leave it, but if it shows signs it's about to go, just replace it. Winter, definitely put the thermostat back in. Cheers.

[@mudaunkhangweni8991]

This video is very good

[@grizzlymane2552]

Nuff said great job 👍🙂