What Does A Cooling Fan Motor Relay Do

87 red wire connects to the positive wire on the electric fan.

What does a cooling fan motor relay do.

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. Just keep in mind that many modern cars use electronic relays. 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.

It ensures that the energy intensive devices only run when needed usually when the vehicle is immobile. Where do the four wires of an electric fan relay go with relay numbers. The cooling fan relay is an electromagnetic switch that controls the power supply to the engine s cooling fans. If the cooling fan motors burn out or fail the cooling fans will be disabled.

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. 30 other red wire needs constant 12 volt power from the. Cooling fans do not function.

If the relay fails it will be unable to supply power to. Non functional cooling fans are another common symptom of a potential problem with the cooling fan relay. 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. Testing the radiator cooling fan relay the cooling fan should be operating.

When the engine temperature approaches unsafe levels the vehicle s computer or temperature. If the motor fails the blades will not be able to spin or generate air flow. What does a cooling fan relay do. The cooling fan relay is the relay that controls the engine s cooling fans.

By using a lower voltage signal to control the relay there is less stress on the rest of the wiring and charging system. 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 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.

The most common problem on these relays is an open or shorted coil. 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. Checking the operation of a fan relay on your vehicle is an easy procedure.