Radiator Cooling Fan Motor: Description and Operation

DESCRIPTION








The fan is electrically controlled by the powertrain control module (PCM) through the fan control relay. This relay is located in the power distribution center (PDC). For the location of the relay within the PDC, refer to label on PDC cover.

OPERATION
The electric radiator cooling fan is controlled by the Powertrain Control Module (PCM) through the radiator cooling fan relay. The PCM regulates fan operation based on input from the engine coolant temperature sensor, battery temperature sensor, air conditioning system activation and vehicle speed.

The fan is not energized during engine cranking regardless of the electrical input from the temperature sensors and air conditioning select switch. However, if engine operation conditions warrant fan engagement, the fan will run once engine starts.

The relay is energized when the coolant temperature is above 80 °C (176 °F) or battery temperature sensor above -12 °C (10 °F) or air conditioning is selected and coolant temperature is above 95 °C (203 °F) or air conditioning is selected and battery temperature sensor is above 41 °C (106 °F).The fan is then de-energize when coolant temperature drops below 82 °C (180 °F) or battery temperature sensor below -9 °C (16 °F) or when air conditioning is selected and coolant temperature is below 92 °C (198 °F), or air conditioning is selected and battery temperature is below 38 °C (100 °F).