Radiator Cooling Fan Motor Relay: Description and Operation

Relay Location:

LOCATION

The relay is located under heater blower motor housing


PURPOSE

The relay supplies battery voltage to radiator fan.


OPERATION

The Powertrain Control Module (PCM) 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 PCM 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 PCM removes the ground (de-energizes) from the radiator fan relay, disabling the cooling fan.