Skip the auto shop - Our mechanics make house calls

Q: Temperature rises when air or heat turned off

asked by on

When I have the air conditioner or heater on, the temperature stays normal. But when I turn the air or heat off, the temperature rises.

A: Hello. If the engine starts to overheat wit...

Hello. If the engine starts to overheat with the heater off or without the AC on, then it is usually caused by an issue with air flow through the radiator. You may have a failing fan relay or a circuit issue within the wiring. A voltage meter would need to be used to determine where the voltage is being lost. I would enlist the help of a certified mechanic, like one from YourMechanic, to inspect for any electrical problems and replace any bad fuses or relays.

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: Car won't start.

There could be several causes as to why your car will not start. Unfortunately without more information, it is difficult to narrow down all of the possibilities to just a few. Some of the more common causes I have encountered...

Q: After a 356 mile commute, my car overheated and anti-freeze was all over my engine and under the hood. No apparent leaks.

Hello, thanks for writing in. I'd be happy to provide my insight. It may be possible that a bad cap was the cause of the coolant under your engine. Radiator caps are designed to hold a specific pressure that is...

Q: Stalls then dies.

Hey there, thanks for writing in about your 1999 Chevy Lumina. The problem sounds like your fuel pump is going bad and getting worse over time. In order to verify the problem the fuel pressure would need to be checked...

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...
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...
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...