What Does A Cooling Fan Motor Relay Do

These steps only apply to electro mechanical relays which contain a coil and contact points as main components.

What does a cooling fan motor relay do.

The cooling fan relay is the relay that controls the engine s cooling fans. It ensures that the energy intensive devices only run when needed usually when the vehicle is immobile. Since power to the cooling fan is sometimes routed through the cooling fan resistor when it fails or has any problems it can cause issues with the regular. When the engine temperature approaches unsafe levels the vehicle s computer or temperature.

The most common symptom of a faulty cooling fan motor are cooling fans that do not come on. 87 red wire connects to the positive wire on the electric fan. 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. The most common problem on these relays is an open or shorted coil.

Cooling fans do not function. 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. If the motor fails the blades will not be able to spin or generate air flow. By using a lower voltage signal to control the relay there is less stress on the rest of the wiring and charging system.

The relay will usually be activated once it is detected that the vehicle s temperature approaches excessively high temperatures. 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. 5 signs that indicate a failing ac fan motor. Where do the four wires of an electric fan relay go with relay numbers.

30 other red wire needs constant 12 volt power from the. When the correct parameters are met a temperature switch or the computer will activate the relay which will allow power to the fans. The cooling fan relay is an electromagnetic switch that controls the power supply to the engine s cooling fans. Non functional cooling fans are another common symptom of a potential problem with the cooling fan relay.

What does a cooling fan relay do. If the cooling fan motors burn out or fail the cooling fans will be disabled. 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.

Checking the operation of a fan relay on your vehicle is an easy procedure. Testing the radiator cooling fan relay the cooling fan should be operating. Just keep in mind that many modern cars use electronic relays.