The most common reasons a radiator fan is not working are luckily due to a blown fuse, bad relay, or a broken wire. It can also be caused by a faulty coolant temp sensor, low coolant level or the fan itself can be damaged.

How do I know if my electric fan motor is bad?

5 Signs That Indicate a Failing AC Fan Motor

  1. The fan won’t start even though the AC is on.
  2. The fan continues to run, even when shutting off the AC.
  3. The fan is on but rotating very slowly.
  4. The fan runs intermittently.
  5. There’s a rattling or buzzing noise coming from the condenser unit when the fan is turned on.

How do you test a cooling fan module?

The quickest way to tell whether or not the electric fan(s) are working is to start the engine. Then, let it reach normal operating temperature and then turn the A/C on. The cooling fan in the engine compartment, should turn on to pull air through the radiator and A/C condenser.

What does a bad radiator fan sound like?

In some cases, when your radiator cooling fan clutch fails, it will develop a whirring or clicking noise. The noise could result from a bearing that is out of place or a bent fan blade that is touching other components.

How do I know if my radiator fan resistor is bad?

Usually a bad cooling fan resistor will produce a few symptoms that can alert the driver of a potential problem that should be serviced.

  1. Engine overheats. One of the first symptoms of a potential problem with the cooling fan resistor is engine overheating.
  2. Cooling fan speed issues.
  3. Cooling fans never turn off.

Can a bad thermostat cause radiator fan not to work?

Broken Thermostat Thermostats are known to go bad and cause all sorts of cooling issues. If this thermostat doesn’t open when the engine reaches the working temperature, the coolant will stay inside the engine block and the engine will start to overheat. This will result in the radiator fan not working.

Does the PCM control the cooling fan?

The PCM controls fan operation; it uses the signal from the ECT or engine coolant temperature sensor. This sensor senses the temperature of the engine’s coolant and sends a variable voltage signal to the PCM. The PCM operates the fan motor through the engine’s cooling fan relay.