Radiator Cooling Fan: Description and Operation

DESCRIPTION
An electric coolant fan aids air flow through the radiator. The fan is driven by an electric motor attached to the radiator support. The fan motor is activated by coolant temperature. If the vehicle is equipped with air conditioning, a switch can activate the fan motor when the compressor is operating.

WARNING: An electric fan under the hood can start up even when the engine is not running and can injure you. Keep, hands, clothing and tools away from any underhood electric fan.

OPERATION
The PCM regulates voltage to the coolant fan relay, which operates the fan when the engine coolant temperature exceeds 106°C (223°F).