Operation

The electric cooling fan operates when the engine cooling temperature exceeds a certain value. The cooling fan on this engine is totally controlled by the Powertrain Control Module (PCM). The cooling fan has one speed. The PCM turns the cooling fan ON by grounding the coil of the cooling fan relay when certain conditions are met. When the A/C is requested, the cooling fan will also be turned ON.

When the vehicle speed is above 38 MPH, the PCM opens the ground to the cooling fan relay because there should be sufficient air moving through the radiator in order to cool the engine coolant. If the A/C refrigerant pressure or engine coolant temperature becomes excessive or the Malfunction Indicator Lamp (MIL) is illuminated, the PCM may turn the fan ON regardless of vehicle speed.