Contents
Why does my radiator fan keep running?
Cooling fans stay on at all times If the cooling fans are staying on at all times, this is another (less common) symptom of a possible problem with the cooling fan relay. If the relay shorts internally, it may cause power to be permanently switched on, which will cause the fans to run at all times.
Should radiator fan turn on when AC is off?
Both radiator fans should always run when the AC compressor is engaged. To check the temperature at which the fan comes on, turn the A/C off and keep the engine running until it reaches normal operating temperature. Most fans should come on when the coolant reaches about 200 to 230 degrees.
What if the radiator fan turns on only when the AC is on but overheats when is off?
The most likely culprits are a thermostatic switch, fan resistor, temperature switch, low-speed or high-speed relay, or a wiring issue. 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.
When does a Mazda 6 radiator fan run?
You’ll typically see coolant fans run when there is little or no airflow across the radiator (i.e. when the car is stationary or travelling at low speed in traffic.) Turns out this is a very common problem with all first generation Mazda 6 cars: The Fan Control Module (FCM) has a high failure rate.
Is it OK to leave the cooling fan on when the engine is turned off?
Car Fan Still On When Engine is Turned Off You park your car, turn off the ignition and start walking away. Then you notice the engine cooling fan is still running even though the car is turned off. It is ok for the engine cooling fan to keep running for a few minutes after you turn off the car.
What was the problem with my Mazda 6?
Turns out this is a very common problem with all first generation Mazda 6 cars: The Fan Control Module (FCM) has a high failure rate. I replaced my FCM and it solved this problem.
What happens to the coolant when the engine is turned off?
When the engine is running, the coolant circulates from the engine and flows to the radiator, where heat is dissipated. When the engine is turned off, the coolant doesn’t circulate, and the heat stays trapped, therefore prolonging the engine from cooling. Running cooling fans help cool down the engine even after you turn off the car.