How To Test Cooling Fan Motor Relay

If no power is observed at either 87 or 30 the fusible link or maxi fuse has shorted.

How to test cooling fan motor relay.

Verify the new cooling fan relay is properly seated. The engine coolant sensor or a separate engine temperature switch is used to monitor engine temperature. How to test your cooling fan relay on 96 00 honda civic how to test your fuses. The engine cooling fan only runs when needed to help cool the engine.

Visually look at the base of the cooling fan relay to be sure the base of the relay is seated completely into the socket. 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. The most common problem on these relays is an open or shorted coil. The relay will usually be activated once it is detected that the vehicle s temperature approaches excessively high temperatures.

Install new cooling fan relay. Because it can allow the engine to overheat. Position the relay above the recess where the original was removed from and gently press it into place. Just keep in mind that many modern cars use electronic relays.