What causes a fan not to work?

What causes a fan not to work?

Six things may prevent an electric cooling fan from coming on: Defective temperature switch, coolant sensor or other sensor. Engine thermostat is stuck OPEN (engine never gets hot enough to turn on the fan) Faulty fan relay.

How do you test a radiator fan?

How to Check a Radiator Fan

1. Determine whether your radiator fan is manual or electric.
2. To check an electric radiator fan, start the car and let it get up to the temperature where the fan normally kicks on.
3. Use the volt meter to test if there is power to the wires.
4. Normal voltage for a radiator fan is around 12 volts.

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

One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. If you notice that your engine is running at higher temperatures than normal, that may be a sign that the relay is not functioning properly.

How the cooling fan relay works in low speed and high speed?

During low speed operation, the PCM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. During high speed fan operation, both engine cooling fans have there own ground path. The result is a parallel circuit with both fans running at high speed.

How do I know if my cooling fan is bad?

Symptoms of a Bad or Failing Cooling/Radiator Fan Motor

1. Cooling fans do not come on. The most common symptom of a faulty cooling fan motor are cooling fans that do not come on.
2. Vehicle overheating. Another symptom of a possible problem with the cooling or radiator fan motors is the vehicle overheating.
3. Blown fuse.

What is the fan behind the radiator called?

Those located at the rear of the radiator are called puller fans. The pusher fans receive air that comes in through the grill area and then they push that cooler air over the radiator. The puller fans pull the air from the grill, drawing it over the radiator.