Rear HVAC Housing

DESCRIPTION





Models equipped with the rear heating-A/C system are equipped with a common rear heater-A/C housing (1) that combines A/C and heating capabilities into a single unit mounted in the rear of the passenger compartment.

The rear heating-A/C system is a blend-air type system. The rear A/C system is designed for the use of a non-CFC, R-134a refrigerant and uses an A/C expansion valve (6) and an A/C evaporator (5) to cool and dehumidify the incoming air prior to blending it with the heated air. A blend door actuator (8) operates the blend-air door which controls the amount of conditioned air that is allowed to flow through, or around, the heater core (7). The temperature control determines discharge air temperature and moves the blend door actuator. This allows an almost immediate control of the output air temperature of the system. The mode door actuator (9) operates the mode-air door which directs the flow of the conditioned air out the upper or lower air outlets, depending on the discharge air temperature selected. The rear blower motor (2) controls the velocity of air flowing through the rear heater-A/C housing by spinning the blower wheel at the selected or programmed speed by use of the rear blower motor power module (3). All rear electrical components are connected to the vehicle electrical system by the rear heater-A/C wire harness (4).

The rear heater-A/C housing must be removed from the vehicle and disassembled for service of the A/C evaporator, heater core, mode-air door and the blend-air door.