Radiator Cooling Fan Motor Relay: Description and Operation

Relay Location:

LOCATION

Relay is located under heater blower motor housing


FUNCTION

Relay supplies battery voltage to radiator fan.


OPERATION

The engine controller applies or removes the ground from the circuit to energize or de-energize the relay depending upon the cooling demands of the engine.

When the coolant temperature reaches 207° F. (97° C), the engine controller applies the ground (energizes) to the radiator fan relay, enabling the radiator cooling fan to operate. When the engine temperature drops below 201° F (94° C), the engine controller removes the ground (de-energizes) from the radiator fan relay, disabling the cooling fan.