Replacing Cooling Fan Motor Relay

Disconnect connector and remove cooling fan relay.

Replacing cooling fan motor relay.

To test the cooling fan unplug the cooling fan and you ll need something to connect up the fan directly to the battery. The cooling fan relay is the relay that controls the engine s cooling fans. If you connect it straight to the battery it should turn on. Visually inspect the.

This is really an engine cooling fan relay but i can t find a wiring diagram for another fan relay. Look for fan relay 45 in the underhood relay box. Also there s fan fuse 20 which powers the relay. Testing circuit 87 and 30 step 14 when replacing a relay be sure to match up the terminal location from the old relay to to the new unit.

The relay is hot because it s being switched on and electricity is running through it but it s not being drawing by the fan motor. Testing the radiator cooling fan relay the cooling fan should be operating. When the correct parameters are met a temperature switch or the computer will activate the relay which will allow power to the fans. There s an a c compressor clutch relay which is 44 in the same relay block which is powered by 10a a c fuse 30.

Compare the replacement cooling fan relay to the one being removed. If your cooling fan runs all the time or not at all or if your engine runs hot it might be time to replace your cooling fan motor or relay. The cooling fan relay is the relay that controls the engine s cooling fans. If the fan motor fails to activate electrically check the cooling fan fuse and relay and replace as needed.

The relay controls when the fan turns on and off based on coolant temperature. Most commonly used connectors are a push type connector. The relay will usually be activated once it is detected that the vehicle s temperature approaches excessively high temperatures. The cooling fan relay has an electrical connector that will need to be disconnected and switched over to the replacement cooling fan relay.

Check both of those relays and. Testing low and high speed cooling fan relays. By hand spin the fan blade it should freewheel if the fan motor does not spin or is hard to turn it has failed and replacement is required. To inspect a cooling fan start with ignition key off.

When the fan is on too often or won t come on at all a new relay may be the solution.