Cooling System: Description and Operation
DESCRIPTIONThe Cooling Fan System consists of a variable speed Cooling Fan Motor and a Variable Control Relay Module (VCRM). The VCRM interfaces with the Powertrain Control Module (PCM) to provide control of the cooling fan.
OPERATION
The PCM monitors coolant temperature. vehicle speed, A/C head pressure, and A/C status to determine the speed at which the fan will operate. Once the fan speed is determined, the PCM signals the VCRM's fan output driver applying battery voltage from the Cool Fan Fuse to the windings of the Cooling Fan Motor.