Skip the auto shop - Our mechanics make house calls

Q: Heater

asked by on

The.heater only runs on cold an the person who had it last said that there some type of switch under the dash but I'm not sure where it is
My car has an automatic transmission.

A: The heater uses hot engine coolant to warm ...

The heater uses hot engine coolant to warm the vehicle cabin. If the heater is blowing cold, the first thing to check is the coolant level. Low coolant, or a problem somewhere in the cooling system, will affect heater operation. Other potential causes include a thermostat that is stuck open (not allowing the engine to reach operating temperature), air in the cooling system or a bad heater core. I recommend having a professional, such as one from YourMechanic, diagnose and repair this heating problem for you.

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 and transmission fluid

The cabin heating system and the automatic transmission have no connection. Faults in one do not affect the other. The transmission fluid leak is possibly in the tubing and/or rubber hoses through which transmission fluid flows to the radiator and...

Q: My car won't start 0 1996 Buick Park Avenue

Before you go digging for the starter motor theft deterrent relay, I suggest making sure it is indeed a problem. Check for power at the purple starter solenoid wire while the key is in the crank position. If you have...

Q: Oil type - 1999 Toyota Camry

Hello. I would suggest not putting in 20w50 oil as it is too thick and can cause engine damage from tight areas of the engine that will not get oil. You should use 5w30 only.

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...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.