Skip the auto shop - Our mechanics make house calls

Q: Thermostat has gone bad

asked by on

My message center is saying Engine Hot, AC Off, but the engine isn't hot, and the coolant is full. Someone told me that the thermostat needs replacing.

A: It is possible that your thermostat could b...

It is possible that your thermostat could be causing this issue. It is also possible that a bad coolant temperature sensor is sending false information to the computer. I would ask for help from one of the mechanics at YourMechanic to come to you and diagnose exactly what is causing your thermostat problem.

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: Engine light still on after replacing the gas cap

This is a simple fix. Replace the fuel cap. The cap sometimes does not reseal after refueling causing the system to detect a leak. Make sure the cap is sealing after you refuel and make sure the vehicle is turned...

Q: I had my coolant temperature senor change about to weeks ago. It has be working great up intill yesterday after I got off of work. 2007 Saturn Aura

Hello - from your symptoms, it sounds like either the coolant temperature sensor is malfunctioning (or disconnected), or the thermostat is stuck open, not allowing the engine to warm up properly. Check coolant level to make sure you haven't lost...

Q: What does the Service AC System message mean?

The Service AC System message can appear on your driver information center (DIC). When the DIC displays this alert, then there is an issue with your air conditioning system, and the system needs to be serviced.

Related articles

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...