Control Module HVAC: Description and Operation

The rear A/C control module is mounted to the upper left side of the rear evaporator housing in the rear compartment, where it can be accessed for service.

The rear A/C control module has wire connections to the rear A/C blower motor switch, rear evaporative temperature sensor, solenoid valve, rear A/C temperature control and the temperature sensor. The rear A/C control module cannot be repaired and, if faulty or damaged, it must be replaced.

The rear A/C control module is supplied battery power through the rear blower switch and a 7.5 amp fuse. The control module receives input signals from the rear A/C blower motor switch, rear A/C temperature control, rear temperature sensor and the rear evaporator temperature sensor when the front A/C switch is turned on. The rear A/C control module uses the input signals to control rear blower motor speed and output air temperature, and to prevent freezing of the rear evaporator core.