Skip the auto shop - Our mechanics make house calls

Q: my car heater gets warm but not hot.the car temp.is fine but i need more heat for the winter.does it sound like i need a new therm

asked by on

m car heater gets warm but not hot.the engine heats up fine.when i stop at a light the heater temp.goes down then goes back up when i start driving gain.does it sound like i need a new thermostat?

My car has 1350000 miles.
My car has an automatic transmission.

It is possible that the thermostat is stuck open. When this happens, the engine can run much cooler than it is intended to. Running "too cool" can effect fuel mileage, emissions, and heater output. Most modern engines operate around or above the boiling point of water - 200-225 degrees. The thermostat generally opens when the coolant reaches 190-195 degrees. Part of it’s job is to restrict coolant flow so the engine can reach those temperatures. If the thermostat is open constantly, the engine may never reach operating temperatures. Have a certified technician inspect and/or replace the thermostat.

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!
  • Home
  • Questions
  • my car heater gets warm but not hot.the car temp.is fine but i need more heat for the winter.does it sound like i need a new therm

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: I had a wire switch connected to my 06 torrent to make my air work now my key wont cut the car off my engine not getting gas

The check engine light with an arrow pointing downward warns of a "reduced power" engine operating condition. That issue is common enough that a specific diagnostic, namely a Reduced Engine Power Warning Light Diagnostic is performed by technicians dispatched by...

Q: Check Engine light comes on, mechanic replaced o2 sensor but light still comes on.

Hi there: If the mechanic completed the O2 sensor replacement, reset the codes and the error code was triggered again, it is possible that the catalytic converter is damaged and needs to be replaced. However, it's also very common for...

Q: Need tips to improve acceleration on my car

Your vehicle is meant to use 87 octane regular gasoline. If the poor acceleration is a new issue, many mechanical faults, such as low fuel pressure or a clogged air filter may be causing the problem. Improving acceleration, even with...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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...