Most Common Symptoms of Bad Engine Coolant Temperature Sensor | Signs of failing ECT sensor

Engine coolant temperature sensor is a device that measures the actual temperature of engine. This measurement are used by the ECM to regulate the ignition parameters and to activate radiator fan. This video provides some basic symptoms when ECT sensor fails.
Related Questions:
What happens when engine coolant temperature sensors fails?
Why do radiator fan in my car always ON?
How to replace a engine coolant sensor?
Can i drive with bad engine coolant temperature sensor?
Can a bad coolant sensor cause your car to overheat?
Related DTC codes: P0115, P0116, P0117, P0118, P0119, etc...
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[@danielmulligan2278]

If you found this video and have a 2016 ford fiesta S/ SE the sensor does not need to be wrenched out. There is a retaining pin you pull out with pliers and then pull the sensor after that. the sensor will just free spin if you wrench it on that model. thanks for the video it was very helpfull.

[@cecilsabourin9462]

As below ,this is awsome info,same symtoms as my Chev. pickup. The one sensor I did not replace on my 31 year old truck . Thank you so much.

[@dailyhandsdiy]

Glad to hear from you 😊

[@charmainperry7553]

Thank you for the video 😊 I just started having problems with my fan not working. Hopefully this sensor is what I need

[@johnknight8540]

Me too. Checking fan relay its showing the right voltage to fan . Hot wired fan it works. So the cooling sensor is next . But its behind the alternator and unter the intake. Sooo gona just remove alternator change it and put new belt on .Hopefully thats solves it being the fan relay module is $160 vs temp sensor at $20.

[@maddiea992]

This is awesome! Thank you so much you have just helped me find my issue

[@dailyhandsdiy]

Glad to hear from you mate 😊😊

[@piyushaggarwal6294]

​@@dailyhandsdiy Dear sir/viewers My ECOSPORT diesel 2018 for which i wanted to flush coolant of it 4 days ago when i put radiator flush in it and start the heater in this summer season as per instructions on bottle kept it on idle the car temperature is starting to drop significantly from 50% operating temperature to 25% what could the problem here as my car temperature stays optimal when i run on ac and fan also works properly but on heater it got dropped to 25% so i feared and turned off the engine. Please tell me what could be the problem here does it have bad thermostat,water pump or any other problem? Please reply Thank you.

[@kriskaagada]

Thanks for the good explanation

[@Eddythe_Eagle]

I am not sure were the othervtemp sensor is. I will try changing the coolent sensor first. Having a good scan tool may help! Thanks for the update!

[@west_park7993]

i used loaner tool innova 3130lat from autozone.

[@user-hq7ff6kx6b]

Hello, my car is a fiat bravo 2 2008 1.6 multijet diesel. Since I have it from the last summer the car does not have a stable idle. In the winter that problem was gone. This summer it is here again. I tried a lot of things but nothing is helping. Now I have error codes P01EA and P0487(for EGR). P01EA looks like very generic code but it looks like the ones for engine coolant problems. So I am thinking is it possible for a faulty coolant temperature sensor to cause an unstable idle when the car is warming and hot? For example, maybe the coolant temperature sensor is sending wrong information to the ECU that the car is still cold and the ECU is pushing the wrong air-fuel mixture as if the car is cold? Thanks in advance!

[@Eddythe_Eagle]

The coolant sensor was changed before. My scan tool says that it is runnubg a few degrees over normal temp! I pulled all the plugs today to find that engine oil waspushing up into the plugs. Two plugs had a lot of oil on them. I cleaned them and re installed them. Nexdt week I will remove onlt those two plugs to see if they are wet with oil. If so, the seal gasket must be broken under the cover. In that case I would need to replace that gasket that prevents engine oil from spashing up onto the plugs. Anyways thanks. The ECT sensor was replaced some time ago with a OEM part. Maybe it is still bad!

[@johnnywadd7960]

Another Great video

[@piyushaggarwal6294]

Dear sir/viewers My ECOSPORT diesel 2018 for which i wanted to flush coolant of it 4 days ago when i put radiator flush in it and start the heater in this summer season as per instructions on bottle kept it on idle the car temperature is starting to drop significantly from 50% operating temperature to 25% what could the problem here as my car temperature stays optimal when i run on ac and fan also works properly but on heater it got dropped to 25% so i feared and turned off the engine. Please tell me what could be the problem here does it have bad thermostat,water pump or any other problem? Please reply Thank you.

[@user-meandme]

I took my 2010 Camry to the Toyota dealer and they diagnosed my cooling sensor to be the issue of my temperature gauge going so high almost one line before it hits red, the temperature gauge kept going up and down and was never down to C anymore when my car was home all night before going to work!

[@omargrant3877]

hey when I turn my key when my car has sit for few hours and I try to start the car it stutters and does not start the engine sign comes up and when I finally do get the car started the fan runs at maximum speed even and for a while after the car has been turned off, also the temperature does not change on the dashboard it stays at lowest temp even when I have driven few miles can you tell me what is the issue?

[@worshiprisetv]

My 2018 Honda CRV keeps overheating even when I’ve changed the temperature sensor and surprisingly too the fans work intermittently. What could be the problem ?

[@lifeistoshorttolookback]

2007 f 150 temperature raises when driving over 55 and goes back down when driving below 55. I changed the thermostat and the temperature sensor, and it is still the same issue. I'm I missing something?

[@firoznanji1771]

Excellent explanation, I hope you get viewers. Thank You. I have a problem with my car, Fan on when engine cold. Also, Ignition ON, No check engine light. No start condition.

[@dailyhandsdiy]

Yup thats a sign but be sure to check the wiring too...

[@piyushaggarwal6294]

​@@dailyhandsdiy Dear sir/viewers My ECOSPORT diesel 2018 for which i wanted to flush coolant of it 4 days ago when i put radiator flush in it and start the heater in this summer season as per instructions on bottle kept it on idle the car temperature is starting to drop significantly from 50% operating temperature to 25% what could the problem here as my car temperature stays optimal when i run on ac and fan also works properly but on heater it got dropped to 25% so i feared and turned off the engine. Please tell me what could be the problem here does it have bad thermostat,water pump or any other problem? Please reply Thank you.

[@jordanclark1715]

87 toyota pickup 22r changed the entire cooling system and still wants to run hot. Could it be a temp sensor?

[@lauriemaguireakagramma989]

caballero 231 v6 1981 3.8 litre choke light stays on... what is the normal temperature

[@west_park7993]

I have temperature warning flashing, or staying on a while, but it is intermittent. I have P0117 code. not the other. smooth idling, no smoke, normal fuel consumption. thanks.

[@johntrovy5528]

Very good informative video. Thanks for sharing. Helped to cover the thermostat part. i have 2010 ML550, ans got P0128 code, just wanted to know if i should check coolant sensor before going for coolant thermostat?/where exactly this sensor is located? If i can have a diagram or picture to locate it so that i can replace it. Appreciate your help!"

[@dailyhandsdiy]

Hi there, you could use an external thermometer and compare the reading from sensor to check of its working good. Mostly the thermostat goes out.

[@piyushaggarwal6294]

​@@dailyhandsdiy Dear sir/viewers My ECOSPORT diesel 2018 for which i wanted to flush coolant of it 4 days ago when i put radiator flush in it and start the heater in this summer season as per instructions on bottle kept it on idle the car temperature is starting to drop significantly from 50% operating temperature to 25% what could the problem here as my car temperature stays optimal when i run on ac and fan also works properly but on heater it got dropped to 25% so i feared and turned off the engine. Please tell me what could be the problem here does it have bad thermostat,water pump or any other problem? Please reply Thank you.

[@Amahyze777]

Was it the sensor or thermostat

[@crackbabyv245]

@@piyushaggarwal6294ever found the solution man?

[@randyu8688]

​@@Amahyze777pls respond

[@isaacb.m.5397]

You just got an new subscriber. 😎

[@dailyhandsdiy]

Thanks mate 😁😁

[@isaacb.m.5397]

@@dailyhandsdiy Not a problem. When is your next video?

[@dailyhandsdiy]

Will be up shortly...

[@isaacb.m.5397]

@@dailyhandsdiy Good to hear, bro. 😁

[@piyushaggarwal6294]

​@@dailyhandsdiy Dear sir/viewers My ECOSPORT diesel 2018 for which i wanted to flush coolant of it 4 days ago when i put radiator flush in it and start the heater in this summer season as per instructions on bottle kept it on idle the car temperature is starting to drop significantly from 50% operating temperature to 25% what could the problem here as my car temperature stays optimal when i run on ac and fan also works properly but on heater it got dropped to 25% so i feared and turned off the engine. Please tell me what could be the problem here does it have bad thermostat,water pump or any other problem? Please reply Thank you.

[@forzainter8380]

Hello, I have problem with this sensor on Passat b6 2.0. When I put sensor, i can start car with cold motors, and drive 10 minuts, when temp.is on 90C. Then I turn off car, and again start engine, but he is down, every time, I cant start motors when temp. is on 90C.Cold is OK start. What do I doing now? Change senzor or what? Thanks

[@tomtran614]

Hey man. My 07 Accord got the P0128 code. I replaced the thermostat and refilled (all OEM). The same code came back. The mechanic tested the coolant temp and said it's within the normal range. He thinks it's the fan switch/sensor and the coolant sensor near the engine are to blame need to be replaced? What do you think? Is it possible that both sensors go bad at the same time? Why not replace the fan sensor first and see if that will resolve the issue?

[@paulworley7081]

I was wondering if this is what's causing the problem on my Vauxhall astra, the coolant levels fine, temp. Gauge normal, but fan seems to be running constantly?

[@rudolfmaluleke7622]

My VW struggles to start when the temperature is hot outside and even the temp read in the car is normally higher than it actually is. Is this might be the sign of faulty sensor?

[@nieceyprettysmile2197]

Right on the note

[@diacstefan5260]

Very useful video keep going. Tomorrow, i will change the sensor, which the cooler fan runs immediately when i turn the key on, which is no need to be on at that point because engine is cold.

[@dailyhandsdiy]

Hi, be sure to check the connector for corrosion as well.

[@cecilioesparza7368]

My ac went out data error say in cluster , temperature gage is down,,help

[@scottcrudge]

Hiya, trying to sort a problem out with my car at the moment, e46 m3, driving back from germany yesterday the gauge was reading hot with the red light on, nothing boiled over, heaters was fine, didnt really notice the fuel smell as my cars map is rich anyways,, i did have a rough idle though, only saying about the sensor as i drove all the way back to the uk with the gauge pinned to red and was fine, once i stop the gauge reads dead cold too. Could this be a faulty sensor. Thanks. :)

[@jakemorrison8507]

Hey sounds like exactly what mine is like now. Can you remember what rhe fix was? Was it just the coolant sensor?

[@scottcrudge]

Nope. The problem for me was the waterpump, it grenaded its self on the autobahn in germany at 180mph. Lol. Suppose a 21 year old pump couldn't handle it. Lol. All good now, refreshed the whole cooling system!

[@jakemorrison8507]

@@scottcrudge ah nice one. Good to see you still got it haha. Cheers for the reply 👍

[@akafridi6096]

Experienced the same issue My car Coolent temp sensor was faulty

[@bigjonb6778]

I have a 2001 grand marquis and today it just started losing power when I give it gas then the temp gauge maxes out for a couple seconds then goes back to normal and the the car runs normal until it does the same thing. I saw that it could be the head temp sensor. What are your thoughts? Thanks

[@shawnp8076]

Did you figure it out my 04 f150 5.3 just started having a problem I got the p1299 code

[@Tipman2OOO]

Air bubble in the cooling system you probably have a coolant leak somewhere. Top it up and burp the coolant, you should see the problem stop.

[@Manmadecontent]

@@Tipman2OOO how do you burp a engine

[@Tipman2OOO]

@@Manmadecontent put a funnel on the radiator fill so the water level is above the top level on the engine and heater core. Start with the engine cold, turn it on, and add coolant until the bubbles stop coming out. it should take about 10-15 minutes. Then cap it off and you should be good to go.

[@slimmyhendrix82]

Have you tried remodulating the inducer valve conducer spring? All you need is about a ½ gal of used gas, couple toothpick halves, Get someone to lend you a 10-20 gal fish tank (preferably with fish already in it), take it to the closest pet shop and have them board the fish for however long you'll need. Soon as you get home its imperative that you run in as fast as you can with the tanks remaining contents to prevent the aquarium rocks from dissolving cause you'll need those to filtrate the coolant immediately once it reaches room temperature upon your return. Make sure you prop the hood 1st to cut down your clean time tho. Once the hoods secure, dump the tank water and its remaining contents over the radiator fans at a slow drip pace. Yeah your arms will get sore holding the aquarium up that long but once U see the end result you'll be all like: hell yeah bro😎. U don't know this but the fish oil has healing properties you can use to budget fix any all terrain vehicles internal components. Although you'll have to repeat the process every 398 to 11,492 miles or 14.3 months, whichever comes 1st. Just don't forget to soak the alternator in some organic pickled bologna juice for 46 hrs before you try to start it back up or you'll have to replace the whole windshield. And U already know how long those take to make this time of year smh. As they say in New Jersey Fuggitabowtit

[@jasonnasiry]

Hi I got a P0181 fuel temperature sensor circuit a on Mitsubishi 2002 Galant what's this and any tips please ..

[@dereckc9469]

I got it too after installing an aftermarket fuel pump. the stock fuel temp sensor had a resistance 2 ohms at around 70 deg the aftermarket was around 1k ohm at 70 degrees. pull the bac seat remove the panel and disconnect harness from the fuel pump. you'll then be able to test the two pins going to the fuel temp sensor for resistance/continuity. if that checks out check wiring.

[@BryanG830]

Wow! I found the issue

[@pbrown6097]

Well what was it???

[@terrymillionarejones1185]

Hello, I have a 95 roadmaster my heat has not been working and I've noticed even after I let it run my temp gauge does not move up very far staying on the cooler side

[@Tipman2OOO]

Bad thermostat it is stuck open.

[@Luminous.Dynamics]

Could be water pump not working or thermostat. More likely the water pump

[@k.esperanza2390]

My gauge won't move and I've had the water pump, thermostat, and coolant temp sensor replaced and still get a code for low flow ..07 TrailBlazer ls

[@m0rpheus999-gu3hu]

Mine is all of the above symptons but also gets a misfire when driving it also is that a flag for that too

[@BRED23]

so I changed my coolant temp sensor and on the way to get it re scanned on the dash it said “coolant temp” and flashes of very quickly after that it said engine over heating so I turned it off waited a minute turned back on and it started rough but started I drove it bakc home and now I’m scared to move it

[@richardj8853]

My 2006 honda city's radiator fan kicks in only when the AC is on ( both the AC condenser fan and radiator fan kick in ) . The Radiator fan doesn't function (without the AC ) even after 15 to 20 minutes of idling . 2) the idling is rough and there's a strong smell of petrol when I start the car . 3) The car is idling at 1500 rpm and after about 10 minutes it settles at 1200 rpm. Are these all point to a bad ECT switch ?

[@solisproductions_3922]

Did u happen to figure out your problem?? my 09 civic Si is doing the same thing I got code p2101 and car went into limp mode I removed the throttle body and cleaned it and reset the car it still idles rough and has the same petrol smell but hasn't went into limp mode it's running too rich I'm thinking it's the temp sensor or MAF. Throttle body is 1000$ for an oem new from honda guess I'll start with the temp sensor to see if that fixes the issue

[@natanmelese1]

Did you find the problem?

[@richardj8853]

@@solisproductions_3922 hi i figured out that the radiator fan motor went bad and it wasn't spinning at high speed (the way they're supposed to) so after I changed the fan, the over heating issue was solved... Btw I also got the radiator completely cleaned. We also noticeeld that the air filter assembly which fits into the throttle body was half broken so air was getting sucked from the broken part so my car's throttle body and air intake was completely filled with dirt... Got all that fixed and put new spark plugs and it's all good now.

[@richardj8853]

@@natanmelese1 the over heating was because of the radiator fan motor which gave up and wasn't doing it's job. So I changed the radiator fan and also got the radiator cleaned thoroughly and now I don't have any over heating issues. The electrician checked the entire wiring and then tested the fan and that's when we figured out that it had given up.

[@tangulo8869]

Years ago the coolant temperature sensor went bad on my chevy van and it started smoking like a diesel engine out of tune.

[@AZ_WEDDO]

Mine says engine to hot a/c shut Off tempure sencor stays at cold. This is an issue after a motor rebuild. They fixed it but the error Message is back. Assuming it May of been a loose wire not The actual sencor.

[@user-so2fq7un9e]

I have a Opel Corsa it don't wanna rev up....when I unplugged temperature switch then car starts but don't rev up....when I plug it back in car switch off

[@djdarrenrv]

2005 police crown vic ---- BRO I NEED HELP! been having overheating issues & replaced everything in the system. NOT overheating anymore but the radiator fan goes to high after only 5 mins of running. stays on high fan until shut off. replaced the radiator, water pump, CT sensor, HT sensor, thermostat (160), fresh coolant after 3 flushes. used a laser temp tool & highest reading on cyl or anywhere, is only 160 degrees. fan will be on HIGH with that LOW temp. CANT FIGURE IT OUT & NEED TO SELL!. NO ENGINE CODES.

[@dailyhandsdiy]

Hi there, if everything is changed then the last would be the ecm itself. Do check the CT sensor reference voltage and ground. Check with a scanner at what temp the fan turns on. Also check the same for oil temp sensor if equiped. Note: An internal corroded wire to sensors can do the same.

[@alexharper9786]

I have issue of my gauge taking 10-20 getting to Operational Temp could the sensor be the issue it takes forever to get in the middle the gauge

[@dailyhandsdiy]

Hi there, This might be a stuck open thermostat valve. when cold the valve should be closed inorder to reach optimum temp faster but if its open, coolant flows through radiator continuously causing rapid cooling and thus takes long to reach optimum temp.

[@alexharper9786]

@@dailyhandsdiy Okay thank you so much I’ll have to check it out didn’t even think about that

[@alexharper9786]

@@dailyhandsdiy Well I changed the Thermostat out the old one was pretty bad put the new one in and still takes 10-20 minutes to warm up and get in the middle

[@alexharper9786]

Maybe the CT Sensor is bad?

[@k.esperanza2390]

Mine doesn't move at all and everything has been replaced... Not running hot but still have the check engine light with a code for ct sensor and it's been replaced too...

[@captainwho1]

My service manual doesn't even say if this sensor being out of calibration could cause my fast idle speed to be too high. 96 Honda Civic EX. Going to check mine just in case because I do have too high of an idle speed.

[@slimmyhendrix82]

Have you tried remodulating the inducer valve conducer spring? All you need is about a ½ gal of used gas, couple toothpick halves, Get someone to lend you a 10-20 gal fish tank (preferably with fish already in it), take it to the closest pet shop and have them board the fish for however long you'll need. Soon as you get home its imperative that you run in as fast as you can with the tanks remaining contents to prevent the aquarium rocks from dissolving cause you'll need those to filtrate the coolant immediately once it reaches room temperature upon your return. Make sure you prop the hood 1st to cut down your clean time tho. Once the hoods secure, dump the tank water and its remaining contents over the radiator fans at a slow drip pace. Yeah your arms will get sore holding the aquarium up that long but once U see the end result you'll be all like: hell yeah bro😎. U don't know this but the fish oil has healing properties you can use to budget fix any all terrain vehicles internal components. Although you'll have to repeat the process every 398 to 11,492 miles or 14.3 months, whichever comes 1st. Just don't forget to soak the alternator in some organic pickled bologna juice for 46 hrs before you try to start it back up or you'll have to replace the whole windshield. And U already know how long those take to make this time of year smh. As they say in New Jersey Fuggitabowtit

[@Capdan365]

I know Honda owners that install a VCM muzzler that suppresses permanently ECT1 temp below 167F, how will this affect fuel/air ratio?

[@hollywoodthedj1673]

I would like to know as well cause I’ve had one on my Honda now for like two years now I’m starting to have problems with my temperature gauge needle dropping all the way to the cold level while driving

[@dailyhandsdiy]

Hi, migh be a loose connection...those connector pins deforms under tension and current passage. Clean and readjust the coupler pins for better contact. This works most of the time.

[@10pm39]

on my 2009 silverado it will pop on the dash "engine hot A/C turned off" and the temp will drop to 160...and also my fans won't cut on. could it be related to the temperature sensor?

[@dailyhandsdiy]

Hi, you might want to check the thermostat valve first.

[@dailyhandsdiy]

Hi, you might want to check the thermostat valve first.

[@CarlosSantibanez-pf8sd]

2020 chevy colorado Colorado temperature idleling cant find the temperature sensor

[@dailyhandsdiy]

It should be right beside the oxygen sensor location. if m not wrong!

[@alekbarber5908]

My car, is vw golf r when I turned off the car before, the fans were working strongly to cool the engine, now I notice that they did not work strongly, and when I turn the car on again after half an hour, I notice that the temperature has risen, and the fans are working strongly, and I turn them off and turn them on again, and the temperature returns to normal in half

[@Rhadoo89]

I think this might be what's wrong with my car. Does the ECT sensor failure always throw an error code and turn on the Check Engine Light? My radiator fan looks like it never starts spinning, and the coolant hoses are very hot. However, I don't get the engine overheat warning light. Also, sometimes it takes a long time to start the engine. So these are two of the signs you mention. What could I do to be sure that the sensor is faulty? Since I don't have any warning light on.

[@Jaffet1990]

so what does it mean when My vehicle radiator fan turns on n stays on the temp gauge says it’s at overheating levels but then it goes back to normal when i’m at a stop and my engine isn’t even showing signs of over heating?

[@Luminous.Dynamics]

Mine did that when I had a leaky hose. Check if its leaking

[@kazymaniac]

My 06 tl recently started to over heat and the radiator fan didn’t kick on, i don’t have a check engine light or black smoke coming out.

[@dailyhandsdiy]

Do check the fan relay and fuse. Or the fan itself.

[@kazymaniac]

I bout new relays just in case, I changed out the temp sensor and it ran great but the radiator fan didn’t turn on only the ac condenser fan(had the ac off)

[@fernandovacarezza1783]

Hi. My jeep crd 3.0 has white smoke. Can this be the problem?

[@slimmyhendrix82]

Have you tried remodulating the inducer valve conducer spring? All you need is about a ½ gal of used gas, couple toothpick halves, Get someone to lend you a 10-20 gal fish tank (preferably with fish already in it), take it to the closest pet shop and have them board the fish for however long you'll need. Soon as you get home its imperative that you run in as fast as you can with the tanks remaining contents to prevent the aquarium rocks from dissolving cause you'll need those to filtrate the coolant immediately once it reaches room temperature upon your return. Make sure you prop the hood 1st to cut down your clean time tho. Once the hoods secure, dump the tank water and its remaining contents over the radiator fans at a slow drip pace. Yeah your arms will get sore holding the aquarium up that long but once U see the end result you'll be all like: hell yeah bro😎. U don't know this but the fish oil has healing properties you can use to budget fix any all terrain vehicles internal components. Although you'll have to repeat the process every 398 to 11,492 miles or 14.3 months, whichever comes 1st. Just don't forget to soak the alternator in some organic pickled bologna juice for 46 hrs before you try to start it back up or you'll have to replace the whole windshield. And U already know how long those take to make this time of year smh. As they say in New Jersey Fuggitabowtit

[@laurasack2668]

What If i don't have no lights coome to scan what is wrong?What if the sensor is reading higher then it is?

[@dailyhandsdiy]

Sometimes the sensor reads correct and the actual temp might be high. Give a check on thermostat.

[@andyl9920]

P0128 bad thermostat. Replaced it. But check engine kept coming back. So im assuming it can be bad cooling temp sensor? Cooling fan only come on when the AC is on. No overheating either

[@dailyhandsdiy]

Might be a CT sensor...also do check the wiring as well.

[@andyl9920]

@@dailyhandsdiy what do i look for on the wires?

[@dailyhandsdiy]

Corroded wires adds up resistance or even loose connectors. clean the connectors, pins. Add up resistance means lower temp reading recorded.

[@tomaspetrus4053]

I Have a mazda3 2.0 petrol and my engine is always cold. I changed thermostat but nothing changed. Should i try to change coolant temperature sensor? I even have a problem with starts. Cold and even with a hot engine. Please give your opinion im out of options i think... I dont know what to do. I need my car to work properly.

[@narci5872]

I have the same problem with my 1.9 tdi passat. I even changed coolant temperature sensor, but it still doesn't read temperature correctly. It stays almost always low. Did you found the solution?

[@tomaspetrus4053]

3 mechanics said that the thermostat is bad. Even tho i changed it. So im going to change it again and we will see. Because logically only thermostat is the right answer to my problem. Because it goes up slowly and then it starts dropping. I think its because its left open. I will write after the change of thermostat.

[@dailyhandsdiy]

Hi, the gauge shows cold if the sensor is damaged or the wire to the sensor is faulty. do check the reference voltage and ground at connector. if you have good 5 or 12volts and good ground, it's probably the sensor. The sensor should be an oe. Aftermarket sensor might have different resistance characters which might cause altered reading too.

[@johnknight8540]

Anybody know what the voltage should be coming from wiring harness to the temp sensor.

[@dailyhandsdiy]

Normaly 2 wire has one ground and one 5v reference. Some comes with 12v. 3 pin type has one reference 5 or 12v, one ground and one nil as its out put.

[@vigneshs6957]

Even after changing the temperature sensor i am getting the same issues like fan continuously running and difficult start of engine. What to do check further?

[@Ninurtha1]

fan relay stuck

[@vigneshs6957]

@@Ninurtha1 Fan relay and currently wiring continuity checked found ok, will it have problem with ECU?

[@PrisonCitySam]

Will a code always pop up when this is faulty or can it go undetected by the computer

[@dailyhandsdiy]

95% of the time, gives a check engine light. Amd if its close to fail, might not give an engine light but shows many symptoms.

[@Jason-db8me]

I replace my coolant sensor but rad fan don't come on,only when I turn on the a/c..Code p0118,unplug sensor and rad comes on,test relay by applying 12v and checking continuity on pins when it's energize..this is a 2016 lancer..need help

[@dailyhandsdiy]

Hi there, radiator fan turns on only if the coolant temp crosses 102 ~ 108 degrees. If you disconnect the sensor, the engine goes to safe mode and fan runs contiously neglecting the real time temp of the car. Check the coolant temp with an external temp guage and check if the fan or relay gets power after coolant crosses 100 degrees. Note. if the coolant crosses 112~115 degress, nd no fan, stop the engine.

[@noguarjan5126]

@@dailyhandsdiy hi I have a 1.9 tdi engine golf 5 and has a starting problem when its cold it starts right up when warm takes longer i unplugged the temperature sensor and it started right up so what should I do replace the sensor or is something else?

[@dailyhandsdiy]

Seems like the sensor is sending wrong info....Replacing it would be good. Also would suggest a professional scaning of engine so to make sure there's no wiring issues or any other sensor's issues.

[@Jason-db8me]

So what would I do cus I replace with new coolant temp sensor same thing,won't turn on only when. A/c is turned on

[@declansgamereview6523]

@@Jason-db8me I got the same problem. Did you solve it?

[@IchigoKurokashi]

Thanks bro for the info. Recently my figo had this sensor problem and the fan won't work when ac is off.I got it replaced and now the fan is only on when the engine is too much hot and the fan turns off after a minute.Is it normal in figo.

[@dailyhandsdiy]

Hey there bro, its normal. fan turns on when the coolant is at 105 degrees and turns of at 95 or smthing. And when the car is at moton its difficult to reach 105 degrees and even if reached it cools down quick. So no worries.

[@IchigoKurokashi]

@@dailyhandsdiy Thank for the reply. Your vedios are really helpful for me and a lot of peoples. Keep up bro

[@dailyhandsdiy]

Thanks to you too bro..made my day...

[@DEAUTOBLOG]

Please my car issues is that 5v signal from the ecu is not coming into the coolant temperature sensor Please what can cause this Is my ecu faulty or what ?

[@dailyhandsdiy]

Either there's an issue in wiring or the ECM itself. You have to find the wire in ecm connector port..check for continuity to sensor connector. If there's no breaks..then the ecm has the issue

[@Eddythe_Eagle]

I have a issue when the outside temperature is warm. Engine when started cold, seems running to lean or rich and stumbles for about 15-30 seconds then settles down. When the outside temperture is very cold the car engine starts better without running rough. I have a new dealer sensor . I hope that solves the cold start issues and a rough idle. Car drives fine. I have tried other easy fix's first, but nothing helped.

[@davidlittle611]

I have the same problem and it started about the time I changed the temp sensors

[@Eddythe_Eagle]

@@davidlittle611 I hope to change the coolant sensor this weekend. I used a original coolant sensor . I hope this helped your problem. Cold start issue a issue. Idling is poor but not stalling. Drives Ok. I will see.

[@davidlittle611]

@@Eddythe_Eagle I changed both identical temp sensors on my 04 Ranger and it solved my issue. It’s confusing because one should be a sender, but it runs properly now.

[@davidlittle611]

@@Eddythe_Eagle one is for the temp gauge, and one is for the computer to control fuel ratio. I had put a sender going to the computer and it screwed everything up.

[@Eddythe_Eagle]

@@davidlittle611 Thanks for the heads up! I will look it up! I tried everything else that is next.

[@RIPdBOON]

Man im stumped. I got the p0115 code but none of the symptoms are showing. The car still drives good. Where should i start? 98 camry 2.2L

[@dailyhandsdiy]

Hi, These symptoms are chances, you might not get these to experience but if you got that code time to check the sensor or wiring....

[@RIPdBOON]

@dailyhandsdiy8721 Thanks for the reply. I replaced the sensor and the code went away. I did notice one of the wires on the pigtail connector looks corroded though, so if the code pops back up I'm going to replace the connector. Great channel I'm going to sub since you replied!

[@dailyhandsdiy]

.Thanks mate and do spray some wd40 to the connector so it wont corrode further 😁

[@Leo22555]

My 2012 Nissan versa cooling fan won’t turn on but turns on when I run the ac ?

[@dailyhandsdiy]

Hi, the fan turns on automatically nly when the temp goes above 90 degrees..may change according to the make of the vehicle. when the ac is switched ON, condenser needs continuous cooling so turns on immediately. You may switch off AC and wait untill the engine temp gets optimum...check if the fan runs intermittently.

[@KINGTYRELL22]

Can this affect air conditioning too?

[@dailyhandsdiy]

Yes, ac compressor won't work

[@firoznanji1771]

Will replace this coolant sensor right away....

[@positiveplay1]

Is it a bad sensor when the car says high coolant temp and the temp gauge fluctuates?

[@isaackangas6921]

Could be air in the line

[@nicholasneo5511]

Hello I have a bmw f10 and recently the fan would just run nonstop when I switch on the car…I also noticed the battery drained when I left the car off overnight..I had recently replaced the water pump and thermostat could it be the temperature sensor?

[@dailyhandsdiy]

Mostly yes....if the fan runs continuous even when the car is cold, its most likely the sensor.

[@caddothegreat]

2003 Taurus would not start after it warmed up. Bad ECT. If I unplugged the wiring from the ECT it would start.

[@noguarjan5126]

same problem have you found any solution?

[@caddothegreat]

@@noguarjan5126 My original hot no start was fixed with a replacement ECT. Then when weather got cold. Car would not start cold. Pulled plug off ECT and it starts. Ran the car for few weeks that way with Check Engine ON. I just got a Motorcraft part and now starting cold or hot....for now. The first ECT was a brand X. Herkel I think.

[@slimmyhendrix82]

My Accord does the same. I found that I can literally loosen the gas cap just a smidge and it'll start right back up. Sounds stupid but try it if yall ever have that same issue

[@UQRXD]

And if it leaking is says nothing. This is a sneaky sensor. Most of the time hidden.

[@aok1973]

On mines it’s saying engine is hot.. this is without AC being on but car is not running hot and the tan is coming on..

[@richieray04]

I changed my sensor My fans worked properly for a few hours then went back to staying on even after my car was off... Now the fan will not turn on... I replaced my fan a year ago because the blades were broken so I know it works. Because i tested both the old fan and new fan... My relay fuse for the low fan has melted plastic on one of its prongs... I switched it with a fuse with the same voltage and the fan will not kick on... Any advice???

[@VpnTokyo]

Having the same issue u ever figure out the problem?

[@richieray04]

@@VpnTokyo thermostat housing was leaking still working on it though

[@edwinmays8480]

Shouldn't the temp sensor trip the check engine light on ?

[@dailyhandsdiy]

Check engine light comes on when the sensor is out of range or fully broken....if it not sending proper data inside performance data range. wont trigger a check engine light. This condition is for most modern cars and for older vehicles...wont show unless its fully broken.

[@dodgersfnshepard8673]

Engine temp goes down when heater is turned on... is this the sensor or something else?

[@dailyhandsdiy]

When you turn on heater, heat is taken from coolant. so there will be continuous cooling of coolant. this may lower the coolant temp. Secondly do check the thermostat if its not working properly.

[@marissachavez1418]

Did you fix this problem? I currently have this same issue

[@OscarIvann]

@@marissachavez1418 did YOU fix this problem? Cause I’m having this same issue too lol, I’ve noticed that my temperature goes to 3/4 on idle and as soon as I start driving it lowers down

[@xoticyt1846]

My car a 2006 chevy cobalt ls with a 2.2L ecotec in it only wants to overheat with the ac off, turn it on full blast at max ac and the cars temp comes back into normal operating range

[@slimmyhendrix82]

It has dual Cooling Fans. Your AC's blower Fan is cooling the engine when its on but the Radiator fan is malfunctioning for whatever reason. Could just be a fuse. Google where the Fans fuses are located at cause its very possible you'll have to check multiple fuse boxes. Aint no thing tho and only take you a minute

[@eternallogic6394]

My engine temperature gauge keeps moving back and forth from H to the middle. What could this be?

[@dailyhandsdiy]

Could be a thermostat issue...

[@polliepayton6601]

@@dailyhandsdiy that’s what I thought however, mine is doing the same thing; hearing noises under the cluster, which I’m guessing the cluster needs to be replaced

[@polliepayton6601]

& the car isn’t over heating

[@mrman8856]

@@polliepayton6601 Clogged lines. I just recently had that problem. If it's the gurgling sound you speak of.

[@polliepayton6601]

@@mrman8856 so what can I do to fix the problem?

[@MBenzXXX]

Coolant fan of my car is always running, and the fuel consumption is very high at this moment. I m now sure that coolant sensor the problem is.

[@robertrastapitts]

Sound like my problems with my 05 Mercedes Benz E320

[@darrinwatkins3110]

would this cause car to shut off??

[@tjayayewhy1595]

Yes if there isn't any coolant and it's completely dry.

[@sobasaiyan7972]

My wife put coolant in and forgot to put coolant tank cap back on we drove like that for a day no problems next day left the house made it a mile and got a engine coolant is overtemp warning i pulled over popped hood coolant was low and bubbling no lid on so let it cool and filled it up put cap back on then tried to start it and it wont even crank or anything electronics in car come on like normal but even now 24hrs later still wont turn over or start and still says engine coolant over temp and shows temp gauge maxxed out. Anyone have any ideas what it could be? I do hear a click under fuse box when attempting to turn over

[@ameliafletcher4753]

Alternator

[@MrThedoc87]

How long does the car drive with a bad temp sensor

[@dailyhandsdiy]

It's a bit risky driving with bad temp sensor...if it reads low temp and din signal the ecm to switch on rad fan....you may end up overheating engine and may distroy the engine.

[@MrThedoc87]

@@dailyhandsdiy it just read low temp and should I get the thermostat changed also?

[@dailyhandsdiy]

A low temp reading could be stuck open thermostat. Do check the thermostat before changing the sensor.

[@MrThedoc87]

@@dailyhandsdiy okay thanks

[@CodeE-ny3km]

I have a bad coolant sensor warning that doesn’t change when I put in a new coolant sensor

[@dailyhandsdiy]

Hi make sure to put oe specified sensors only...any aftermarket can trigger the same as faulty

[@PenalverXD]

this is a issue in the saturn sky overtime

[@dzdabeast1816]

My car is starting to over heat and seems like the Fans act up they don’t really kick on and if they do it like really late they don’t turn on time which causes it to over heat and it can be over heating fans won’t be on but soon as I shut the car off the fans will kick on and cool the car down right away but start the car again fans will be off and car will over heat again …… if anybody had similar issue and might know what could it be let me know please thanks

[@slimmyhendrix82]

I have the same exact issue I'm trying to figure out. Does your car start right up the 1st time then takes a few minutes once your out somewhere too? Im Trying to figure out if the 2 correlate somehow or if its 2 different issues

[@Litvagopnik]

Ok Microsoft Sam, whatever you say.

[@dailyhandsdiy]

It's Google sam...😉

[@antyvyruz]

Fuck yea thanks

[@ignaciog.corellag.3149]

Forgot to mention: A/C won't work

[@carlosynfante8414]

Can a bad temp sensor cause a car not to start

[@gelatoconnoisseur5389]

Yes

[@ecolegio]

Is it normal that the computer doesnt let me start the car when ECM fails? Because my car suddenly drops its temp reading to 0, and RPMs start to rise. Then when I turn the car off the fan starts. If I try to start the cart, it won't. My workaround has been to unplug the fan relays, plug them back, and then the car starts again. I tested the relays and they work properly, so I assume it's the ECT.

[@jun91671]

So the the sensor can cause the car to not start

[@ecolegio]

@@jun91671 Yes. The water temperature sensor was failing and the ECU prevented the car from starting. I just changed the sensor and the problem was solved

[@ChrisC1946]

Mine went bad after banging limiter in mud. It ran fine other then my AC wouldn’t work.

[@Masterfixer]

So robotic voice still get monitization? This youtube double standard is not fair.

[@gaucho05]

My gauge doesn’t move at all 😢

[@slimmyhendrix82]

Did you try flushing your blinker fluid? If that wont work than try replacing your exhaust filter and it will reset the temperature gauge sensor back to its factory settings

[@seadragon3350]

There’s another one lower down. No videos on that one. Coolant sensor written on box. Changed one on top another on bottom

[@Mr.Freeze8754]

I replaced 3x the sensor same thing radiator fan don't come on,only made it worse by temperature gauge goes from cold to hot in few second don't understand it

[@Epicsendz]

Air trapped in the system maybe

[@the_return024]

Defective sensor check for ohms.

[@genarogarcia6719]

Will it also cause the ac to stop working?

[@dailyhandsdiy]

In most cases..YES.

[@genarogarcia6719]

@@dailyhandsdiy asking cause when reaching a certain temp. The ac Stops working

[@Socialg35]

@@dailyhandsdiymy heat /air work but as soon as I start driving the fans come on and gauge read a cool temp even tho I can hear my fans running any suggestions? And car heats up quicker than usual when is literally 32 degrees out

[@toxictator4561]

@@Socialg35 Coolant sensor , bad fan motor/wiring/relay . would be where I would start .