What Does A Cooling Fan Motor Relay Do

The cooling fan resistor is an electrical resistor that limits power to the fan in steps so that the fan can operate at different speeds according to the cooling system s demands.

What does a cooling fan motor relay do. The most common problem on these relays is an open or shorted coil. It ensures that the energy intensive devices only run when needed usually when the vehicle is immobile. If the cooling fan motors burn out or fail the cooling fans will be disabled. Cooling fans do not function.

Just keep in mind that many modern cars use electronic relays. The cooling fan relay is an electromagnetic switch that controls the power supply to the engine s cooling fans. Testing the radiator cooling fan relay the cooling fan should be operating. The cooling fan relay takes the low voltage signal and internally switches the relay on to allow battery voltage to be supplied to the radiator cooling fan.

5 signs that indicate a failing ac fan motor. Because the fan motor is one of the hardest working parts on an air conditioner it is subjected to a lot of wear and tear that can lead to frequent repairs or replacement. When the engine temperature approaches unsafe levels the vehicle s computer or temperature. What does a cooling fan relay do.

If the relay fails it will be unable to supply power to. The most common symptom of a faulty cooling fan motor are cooling fans that do not come on. 30 other red wire needs constant 12 volt power from the. Turn the ignition to the on position and jump terminals 87 and 30 the relay is now jumped and the accessory should activate if so the relay has failed.

By using a lower voltage signal to control the relay there is less stress on the rest of the wiring and charging system. 87 red wire connects to the positive wire on the electric fan. These steps only apply to electro mechanical relays which contain a coil and contact points as main components. Once the fan motor breaks down the ac will stop blowing cold air and that s something you don t want on a hot summer s day.

The relay will usually be activated once it is detected that the vehicle s temperature approaches excessively high temperatures. Non functional cooling fans are another common symptom of a potential problem with the cooling fan relay. If no power is observed at either 87 or 30 the fusible link or maxi fuse has shorted. The cooling fan motors work together with the cooling fan blades to pull air through the radiator.

The cooling fan relay is the relay that controls the engine s cooling fans. When the correct parameters are met a temperature switch or the computer will activate the relay which will allow power to the fans. Checking the operation of a fan relay on your vehicle is an easy procedure.