How To Test Cooling Fan Motor Relay

Visually look at the base of the cooling fan relay to be sure the base of the relay is seated completely into the socket.

How to test cooling fan motor relay.

Position the relay above the recess where the original was removed from and gently press it into place. Install new cooling fan relay. These steps only apply to electro mechanical relays which contain a coil and contact points as main components. Just keep in mind that many modern cars use electronic relays.

Or a failure of the fan relay or control circuit is bad news. The engine cooling fan only runs when needed to help cool the engine. 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. The relay will usually be activated once it is detected that the vehicle s temperature approaches excessively high temperatures.

When the correct parameters are met a temperature switch or the computer will activate the relay which will allow power to the fans. So a engine cooling fan failure. Because it can allow the engine to overheat. Checking the operation of a fan relay on your vehicle is an easy procedure.

The engine coolant sensor or a separate engine temperature switch is used to monitor engine temperature. The cooling fan relay is the relay that controls the engine s cooling fans. Testing the radiator cooling fan relay the cooling fan should be operating. Verify the new cooling fan relay is properly seated.