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

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: Charging system failure.

Based upon what you are describing, it sounds like you may have a voltage supply issue due to the amount of power being delivered to the accessories, speakers, etc. that the system is required to produce. If the voltage being...

Q: 1999 firebird every now and then dies while driving and low engine power light comes on

A bad mass airflow (MAF) sensor can cause loss of power, no starts, and lean or rich conditions. If cleaning the sensor did not get rid of the P0102 trouble code, then replace the MAF sensor and clear the...

Q: clutch stiff to depress, and car wont start, battery good no clicking

Hi there. The clutch safety switch it located under the dash on the clutch pedal assembly. From what you are saying though, it sounds like a clutch master cylinder issue. If the piston binds in the cylinder then this will...

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 to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.