Auxiliary Cooling Fan

DESCRIPTION
The auxiliary cooling fan, if equipped, provides additional cooling for low-speed vehicle operations, extended idle, and stop-and-go conditions. The fan will also run after engine shutdown in cases of extreme coolant temperatures. The auxiliary cooling fan is located behind the grille on the right side of the vehicle.

OPERATION
The auxiliary cooling fan circuit consists of the auxiliary fan, relay, and vehicle control module (VCM). When the VCM determines that fan activation is appropriate (a function of coolant temperature, vehicle speed and A/C system status) the VCM completes the ground side of the circuit to the relay coil. This energizes the relay, providing 12 volts to the auxiliary fan. When the VCM determines that fan operation is no longer required, the relay is de-energized and voltage is no longer applied to the fan. Refer to powertrain management for circuit schematic and diagnostic procedures.