Skip the auto shop - Our mechanics make house calls

Q: My radiator fan only turns on when my AC turns on.

asked by on

My car has been over heating when my AC is off.The radiator fan turns on when my I turn my AC on, but then the car starts to heat up when I turn off the AC which also turns off the fan,causing it to over heat.

My car has 180502 miles.
My car has a manual transmission.

A: Hello there, a couple of different items ca...

Hello there, a couple of different items can cause the fan to not work like this. The most likely culprits are a thermostatic switch, fan resistor, temperature switch, low-speed or high-speed relay, or a wiring issue. If the vehicle overheats, care should be taken when driving to prevent further damage by overheating. When the vehicle has the AC on, the engine needs extra help cooling so the ECU commands the fan to be on any time the AC is on. A qualified technician, such as one from YourMechanic, will be able to diagnose your overheating problem and perform any repairs required.

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・Save up to 30%

Get a quote

What others are asking

Q: Air conditioner not blowing out cold air

You will need to have the codes in your vehicles computer read to determine what issue is taking place. There are hundreds of possibilities, without knowing the code you are shooting in the dark. As for the A/C, There could be...

Q: Knocking on passenger side upon start but it stops when I push the recirculation button

From what you describe it would appear that your vehicle is experiencing an issue with one of the AC components. There is an electric motor called the AC inlet valve, which allows fresh air into the vehicle for the AC...

Q: idles rough code sensors

Hello. It may be the new oxygen sensor not being completely compatible with the vehicle causing it to run worse. Have a technician ensure that the new oxygen sensor is wired correctly. Also, check the reviews for the oxygen sensor...

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 Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
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.