How To Test Cooling Fan Motor Relay

Verify the new cooling fan relay is properly seated.

How to test cooling fan motor relay.

Because it can allow the engine to overheat. The cooling fan relay is the relay that controls the engine s cooling fans. If no power is observed at either 87 or 30 the fusible link or maxi fuse has shorted. The engine cooling fan only runs when needed to help cool the engine.

Position the relay above the recess where the original was removed from and gently press it into place. How to test your cooling fan relay on 96 00 honda civic how to test your fuses. The engine coolant sensor or a separate engine temperature switch is used to monitor engine temperature. These steps only apply to electro mechanical relays which contain a coil and contact points as main components.

So a engine cooling fan failure. 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. Or a failure of the fan relay or control circuit is bad news.

Checking the operation of a fan relay on your vehicle is an easy procedure. When the correct parameters are met a temperature switch or the computer will activate the relay which will allow power to the fans. Visually look at the base of the cooling fan relay to be sure the base of the relay is seated completely into the socket. The most common problem on these relays is an open or shorted coil.