Troubleshooting a Water Pump Thermostat Heater That Is Not W... : Timing Belts & Other Auto Repairs

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A faulty water pump thermostat can cause a wide variety of different issues with other parts of your car. Troubleshoot a water pump thermostat with help from an experienced automotive professional in this free video clip.
Expert: Jon Flewellen
Bio: Jon Flewellen started at age 5 by tearing apart his dad's landscaping equipment to figure out how engines worked.
Filmmaker: Philip Quintas
Series Description: The engine is the most important single component in your car - if you take care of it, you'll have a car that operates efficiently for years to come. Get tips on repairing timing belts and more with help from an experienced automotive professional in this free video series.

[@davidhawthorne8474]

Awesome commentary very knowledgeable. Confirmed all my fears. On point ☝️☝️

[@brianbarcus5853]

Great video! Thanks for explaining the connection between the thermostat, water pump, and heater core, now I know what else to look for if the thermostat replacement doesn't solve the problem.Explained very well - what other parts affect the thermostat functioning and what failing parts could mimic thermostat failure. Very well done video!

[@henrylong45]

Best DYI video I've seen. Great job, John!

[@TortureBot]

Extremely informative and well spoken my friend! Maybe you can help me. I have a 4.7 liter V8 Magnum in my 2004 Durango. It was having cooling issues for about 3 years and could only be driven to work and back. It would overheat on long trips. I finally decided to replace my radiator after trying the thermostat and temperature sensor with no improvement. After I installed the brand new radiator and brand new upper and lower hoses and had already done a flush and refilled everything with a 50/50 mix of coolant and water everything was awesome for 2 weeks! It was cooling like the car was brand new. Then suddenly the other day it was trying to overheat on a warm day when I came home from work just like it used to before the new radiator. I have checked over everything and even bought a brand new radiator cap with the pressure release lever and it is still doing it. There is no loss of coolant to be seen under the vehicle and the reservoir jug is staying right in the middle of the minimum and full mark. I checked the little hose that goes to the reserve jug and it is not clogged and the pulley with the fan that goes through my water pump is not wobbly and there is no antifreeze leaking anywhere around it. The heat works just fine so I don't think I have a clog in the heater coil. Do you think this can be a failing water pump with a bad impeller since nothing else is obviously wrong? I thought about replacing the thermostat again, but it's only about 7 or 8 months old. I also thought about replacing the serpentine belt although it looks really good even though it's the original one and I have driven the vehicle 115,000 miles.

[@brendadrettler12]

He's great explaining

[@eurekaperry6309]

Thank You John very much for your video of breaking it down making it very simple

[@eoinf2773]

Great video. Much Thanks 👍 from Ireland 🇮🇪

[@mariannecairns380]

thankyou, most informative and helpful for me, my problem of cold air from heater thanks to you either thermostat or water pump.

[@boratthe]

Understood loud and clear , thanks man👊

[@deejaydemo2984]

Great video mate learnt alot diagnosing cooling system helped very much !!

[@tonyanderson5123]

This guy is probably an auto mechanic shop class instructor.

[@jamesridenhour1520]

I've backflushed my heater core changed the thermostat, checked the blend doors and actuators.. I just replaced the water pump today and it was faulty alright.. hopefully this solves my no heat issue, find out in the morning when I fill her back up with coolant. Needles to say very informative video thanks for sharing.

[@anastasiachandler1407]

Thank you sir,very informative.

[@paulfalcone4115]

Thanks John, explained very well and without vulgarity, I think you have solved my problem. Thanks and God bless

[@charlesno5]

I LIKE THE WAY YOU EXPLAINT MY PROBLEME . THANKS BUDY !!!

[@LOUROLDDAN]

So glad you explained how the 3 components work together.

[@ivangarcia7678]

Brother that was great thanks.

[@gbemisanni5576]

Thank you so much for this video...i love that

[@heroknaderi]

Very Helpful Tips Thabk you.

[@3656761]

Great job explaining this! Would the belt need replacing if it got wet?

[@annaroulston1]

Great video John! Thank you! As an aside, I’ve been searching for a pair of great work gloves. Ideally I’d like them to allow for dexterity/tasks which require fine motor skills. I’d also love a pair which are at least water resistant if not water proof. That being said, I love the gloves you’re wearing in this video. Please let me know the brand, style, maybe even where I can get a pair. Thanks again! Anna

[@keithlewis6887]

Very informative video. 👊😎

[@amanisingh8485]

video on point

[@victor789012]

Que buena explicación . Gracias

[@raymondscat]

Thanks John for this very helpful video.

[@freedomforever3173]

thank you bro

[@payanromano4741]

thank you.

[@brineuslucson290]

very helpfully that's good .

[@metalmaniac375]

how about back flushing the heater core if it is not leaking and see if that corrects the problem... saves a lot of time and money!

[@jessicamedina2733]

Hi I just had my f150 2001 truck water pump fixed a month ago and automatically today it started overheating again and well I stopped to add water and then drove back home and the water basically leaked out all once I got home so do you think it's the radiator or coolant I'm not sure but I hate having the issue would sure love the feedback! 😭

[@oli4111]

hey John my wife come home and her car was over heating 99 Yukon a river of water coming out from the bottom of the suv what is the best diagnostic ? I think the engine is gone what do you think

[@alvinvolvoadventures9675]

Hello I have Volvo 850 GLT 1995, before I change the radiator I flush out all the coolant and then after I installed the radiator I put some water in the reservoir but I notice the water won't drop in to engine and radiator. I start the car and run on idle for 3 minutes but still the water won't circulate. It's all stock up with the reservoir. I un plug the drain plug in the radiator but no water, it's clear that water didn't reach the radiator. It's all stock in reseviour. Do you this its the water pump has the problem? Pls help!

[@tajhealthnature8570]

I have a 2004 dodge durango i fix radiator water pump an auxillary pump. Also thermostat No heat can I bypass the auxillary pump..please let me know. Thank you

[@vadoo1]

Thank you OK

[@michaeladams3851]

I have a Wrangler. Flushed core, still not getting flow to the core. Think water pump? I'm not over heating or leaking anywhere.

[@kuciksteadymelody8375]

Why my water in reservoir tanks bubbling and spit out when i throttle the engine ?? My car use much water also,but find no leaks.

[@melvisamaya5911]

should I replaced the water pump or trade in my car Mazda 626, year 2000.?

[@tyo6896]

Or you can try and flush the heater core. Recommend doing the flow backwards, then forwards, and repeat.

[@notanexpert5010]

So I just changed my water pump with a brand new one same with my thermostat. Heater works and gets hot, truck doesn’t over heat BUT the top of my radiator and top hose gets hot to the touch while the bottom hose and bottom of the radiator remain ice cold… is my radiator bad/clogged?

[@fkthesystem69]

Cheers

[@deksamtorrac6518]

Head gasket leaks, cracked head or cracked block cause over heating as well, easy way to know if it is a leak there, is if there is water in your oil, check the oil cap if it is covered with a milky white foam then water is in your oil and that can be the problem... However, with some cars like the 2000 intrepid the water pump is inside the engine and driven by the timing chain, [ugh.. Why did they put it there?! Grrrr] this can also cause water in the oil and over heating. Also a plugged radiator and or non-working electric rad fan as well can cause over heating as well.

[@Skeksix]

The milky substance in the oil cap doesn't always mean the head gasket has failed or is failing. Cars driving very short journeys can cause it due to condensation, especially in the colder weather.

[@flipinfin]

Does your waterpump work at idle?

[@billwilliams6338]

EHOWAUTO *** ()) Is there any other water pump testing you can do to test and check if the water pump is pumping water into the cars engine and into the cars radiator correctly? How do you test the water pumps Pressure, how much Pressure the water pump hoses are at? The Purpose of the Water Pump is to circulate the radiators coolant into the engine and radiator?

[@msdanyelle1]

I'm not running hot but my radiator not circulating I hear streaking noise under my hood?

[@thingstodowithguru323]

I had coolant leak into passenger compartment of my nissan alitma 2009.

[@fmxinsane]

My 2003 Xterra started overheating. i changed thermostat. still overheating. so i changed water pump. and yes still overheating :S no leaks and no water in the oil so my headgaskets are fine. so what could it b?

[@tonisimmons9749]

You may need to bleed the air out of your system

[@davidbanks2700]

my car is overheating because radiator not sucking coolant (coolant never leaves recovery tank)i tried changing radiator cap n yes fan r working any ideas

[@franciscogomez2565]

DAvid Banks same problem any solution?

[@ceegee3514]

Sounds like youve got a bad thermostat. Does it cool down when you turn on the heater? If so then your thermostat has officially taken a dump.

[@gingerbrocato908]

can some 1 help me plz i have a 2005 dogde noen transmission flue go in in to radiator i no it is cool but can b some else plz hrlp

[@Drakegls]

1st nice video!

[@uploader8297]

I dont see how a clogged heater core can cause an overheat condition. The pipe that goes to the heater and returns is an auxiliary pipe that has nothing to do wirh cooling the engine.

[@algonzalez4157]

Does anyone know why my car gets hot only on red lights , wen I'm driving it goes back to normal

[@chig1376]

Al Gonzalez air in your coolant system, burp the air from the system and youll be good

[@319racing3]

my 1994 Honda is sorting water out the resavior what could that be

[@AaronFernandes__]

Is this like a bubbling affect?

[@austintaylor2251]

Mine is bulbbling

[@stevemcqueen3172]

That sun in Yer eye in the beginning made ya look like poop eye! Aug Aug Aug!

[@eastside.8174]

so if my water pump is out the heat won't work

[@michaelsuchan8934]

sounds like the heater core needs to be flushed

[@marshallstewart9080]

Not necessarily depends on if your water pump is working correctly or if you have enough water in your radiator also check the radiator cap

[@danwalker6422]

So, actually not diagnosing anything.

[@korrisandwalker6466]

96 grand am my thermostat goes inside the water pump. Dont own pontiac.

[@TOBYD7]

Another drawback to not rep[lacing the thermostat is,.. although you will have good flow and cooling in the summer, you will have very long warm up times for engine in winter and heater/defogger and carburetor choke mechanism will not function properly when you most need it. Bypassing the heater core will leave vehicle without heat and defogger when needed. Water pumps and thermostats are very likely to go bad after one or the other fails so it would be a good idea to...forward and backward flush engine, radiator/cooling system and change thermostat if you replace water pump. Might be a good idea to replace water pump if your thermostat failed for a long time... sounds expensive but it will save time, effort and money if you do these things while parts are exposed instead of paying for, or doing the labor for each part individually. Just saying.

[@l.johnson2015]

Pretty sure Im fucked at this point....domino tripple effect...