Skip the auto shop - Our mechanics make house calls

Q: Thermostat not working

asked by on

My temperature indicator in the IP suddenly quit working. It went from normal to zero. Then in nothing flat the display on my IP read “engine too hot A/C off.” This will even happen in the morning after the engine has been off for approximately 10 hours. After the car is warming up from driving the thermostat comes back to life and works fine. I took it to the dealer and they changed the solenoid. It helped for a while but the problem came back after a couple of weeks. Do you have any ideas about what could be wrong?

A: Greetings! I’m inclined to think that the p...

Greetings! I’m inclined to think that the problem will be with the coolant temperature sensor. Have a technician test the coolant temperature sensor and inspect its electrical circuit.

I’d recommend getting some help from a certified technician. They will have access to the factory resistance and output specifications of the sensor. If the technicians readings are out of specification then the coolant temperature sensor will be replaced.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Blower motor not air

You did not mention if you have power from the HVAC blower fuse in right hand interior fuse box. Check this fuse to see if you have power to the blower switch and to blower circuit. If the fuse is...

Q: Where can I find the engine number?

The engine number isn’t generally required for insurance purposes, but it may be needed for warranty work, recalls and for other needs. You’ll find it located in the same place whether you drive a stick shift or have an automatic...

Q: Cooling system

The thermostat is a commonly known part to fail causing the coolant to not flow through the radiator properly causing the engine to overheat. The diagnosis sounds about right and is consistent with a thermostat failing. This can be caused...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.