Skip the auto shop - Our mechanics make house calls

Q: Stuck thermostat?

asked by on

When driving the temp climbs between 210- 245. may bounce between the two temps. Doesn't drop when driving. Heater blows hot than cold. Heater has always blown hot.All these signs just started this morning. Is this a common sigh of a bad thermostat

My car has 218000 miles.
My car has an automatic transmission.

A: From what you described, it potentially mig...

From what you described, it potentially might be a few different things that may be wrong with your cooling system. As you may know, when the coolant is pumped through the radiator to the engine, some of this coolant is recirculated back through the heater core. Heated air from this is blown through the vents into the interior of your car. The fluctuation in temperature may be also caused by a faulty or stuck thermostat which may cause the erratic changes in temperature. This may also be caused by a clogged heater core or even heater core hose leaks. I would recommend having an expert from YourMechanic come to your home to diagnose and repair your cooling system.

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

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: Heater controls not working

Hello, thank you for writing in. There are multiple fuse boxes associated with the vehicle, and you may also need to check the interior fuse box. Fuse number 13 according to my records is for the rear climate control, and...

Q: Heating/cooling system blowing cold/warm air when it should be warm/hot air

This suggests you may have a clogged heater core. As you know, the heater core circulates warm coolant through it that is used to blow the warm air into the cab via the blower motor. The other possibility may be...

Q: Intermittent high revving

Hello there, thanks for writing in about your 2004 Chevrolet Aveo5. While a revving engine is not a normal operation, there are a few common causes for this type of fault. The most common are a vacuum leak, oxygen sensor,...

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...