How do you test a radiator fan on a PT Cruiser?
While you have the test light probe on either pin, slowly turn the fan blade. If the light flickers or goes out completely, then the fan has a dead spot in the windings and will need to be replaced.
How do you diagnose a bad cooling fan?
Symptoms of a Bad or Failing Cooling/Radiator Fan Motor
- Cooling fans do not come on. The most common symptom of a faulty cooling fan motor are cooling fans that do not come on.
- Vehicle overheating. Another symptom of a possible problem with the cooling or radiator fan motors is the vehicle overheating.
- Blown fuse.
How do I know if my electric fan motor is bad?
5 Signs That Indicate a Failing AC Fan Motor
- The fan won’t start even though the AC is on.
- The fan continues to run, even when shutting off the AC.
- The fan is on but rotating very slowly.
- The fan runs intermittently.
- There’s a rattling or buzzing noise coming from the condenser unit when the fan is turned on.
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.
How do you test a motor fan?
How to Test Your AC Fan Motor
- Check the power. If you suspect the fan motor is bad, the first thing you should check is the power to the motor and the power to the air conditioning unit.
- Check the windings. Next, check the windings of the fan motor for an open or a short.
- Inspect the capacitor.
How do I test a radiator fan switch?
Turn on the burner and slowly increase the water temperature. The ohmeter should be turned on and have a reading of high resistance. When the water reaches between 180 to 220 degrees Fahrenheit, the switch should turn on and the resistance seen by the ohmmeter should change to zero.
What tells the cooling fan to come on?
The engine temperature should trigger the fan to turn on. It will also turn the fan off once the engine has cooled to under 200 degrees. You may have heard of a part called the radiator fan switch or temperature fan switch. This is linked to a thermostat and works much like your home’s HVAC system.