How to Test if Your Car's Thermostat is Working (Without Removing It!!)

This is a quick and easy to test to see if your car's Thermostat is operating correctly, without having to remove it!! The video also covers common symptoms of a broken Thermostat, in both open and closed positions.

USEFUL LINKS:

1) How to replace your Thermostat (Grand Caravan/Town & Country):

VIDEO BY YOU WRENCH

[adrianelia]

You explained this in a proper sequence and taught me something. Thank you. And you got right to it without any extra talking bits

[MidnightRambler]

Awesome!! In my younger years I never found an interest in automobiles. Now as I'm much older my interest has changed considerably. Thank you for the great info and I will follow your Chanel.

[GrandLancaster]

I’ve just watch multiple videos on the topic to compare and contrast. This was by far the best video in terms of thoroughness and attention to detail.

[jookk]

Who here cause they ain’t trynna pay them shop prices 😂

[coltonrognrud]

great explanation, cars been overheating and i noticed a hose was leaking but i was still holding a majority of my coolant, turns out my thermostat got stuck closed. thanks so much!

[romanepaillant]

Thank you very much, my 2011 Kia Soul was overheating and I did not know what to check for then after watching your video I did as you said and the car was hot but that hose stayed cold and never get hot then I realized that my Thermostat was stocked on CLOSE position and never OPEN to let the water coolant to flow to the Radiator. Thank you very much and may God Bless you.

[ryannhunter]

I’m really new starting out working on my own vehicles, I really enjoy it but get overwhelmed looking through so many articles trying to find what I’m looking for when I don’t even know where to start and this video was so informative for me, especially since I think I have a thermostat issue and this really makes me feel confident going in and making sure it’s the thermostat and not something else, so thank you so much for this!!

[sgtkickazzTVShorts]

Brooo, I just found you! You're flipping amazing mate!! Greatly well spoken and your English is KILLER!! I UNDERSTAND YOU more then most American English spoken people!! Thanks man!!!! You're a flipping legend!!

[twofeets]

Check engine light came on and the code it threw could have been one of nine different things. This video helped me to diagnose the problem and I learned something in the process. Thank you!

[EdwardHazell]

@3:00 very useful!!

Notes: put finger on thermostat if it stays cool, the thermostat is stuck in closed position, and not allowing coolant through.

Edit*Turn on engine
Leave on for five minutes

[stevehay]

Save me time how to find whether my thermostat working or not, good explanation.

[Hapukina]

This was extremely helpful and very well explained. Thank you

[Aaron-hdql]

Brilliant. Now I can go outside and do the test. Thank you for the awesome video.

[sathir-]

Very helpful. Now I figure out why my Golf is actually not heating up very well. Thanks.

[Joshua-rbhv]

Thank you so much for explaining how it actually works instead of just spraying it out with the hose I appreciate it thank you

[ianbennett]

THANKS! You teach well. Some can DO, but cannot teach (on sooo many videos).

[natefidalgo]

Yes, that a pretty decent way to rule out a thermostat issue. I was kind of looking for a good way / tool to measure coolant flow to diagnose if the water pump is bad and not circulating coolant. Currently this is not an issue for me. But it's one component I don't have a tester to know for sure without removing and inspecting.

[michaelszczys]

What happens often on older vehicles is the thermostat works fairly normal except it won't close up completely and thereby causes the engine to never make it to correct operating temperature that the computer is looking for.
The idle stays fast because it thinks it's still warming up, it runs richer because it thinks it still warming up, and your heat is weak.

[mr.b]

Fantastic information, Sir!!! Awesome video and very clear explanation of how everything works!!! 11 stars out of ten!!

[ritanewman]

Terrific explanation! Very detailed and easy to understand for a novice like myself!