DESCRIPTION

All models are equipped with a common HVAC housing assembly (1) that combines A/C and heating capabilities into a single unit mounted within the passenger compartment. The HVAC housing consists of the following:

• HVAC housing — The HVAC housing consists of an upper housing and a lower housing that are attached together by screws and are mounted to the dash panel behind the instrument panel. The HVAC housing contains the heater core (2), A/C evaporator (3), blower motor (7), blower motor resistor (9), blend-air doors and actuator (10), HVAC vacuum harness (11), floor distribution duct (12), foam seals (13 ) and the mode-air doors and actuators (14).
• Air inlet housing — The air inlet housing (4) is mounted to the right end of the HVAC housing and contains the foam seal (5), recirculation-air door (6) and the recirculation door actuator (8).

The heating-A/C system is a blend-air type system. The two blend-air doors control the amount of conditioned air that is allowed to flow through, or around, the heater core. This single zone heating-A/C system uses only one blend door actuator.

The A/C system is designed for the use of a non-CFC, R-134a refrigerant and uses an A/C evaporator to cool and dehumidify the incoming air prior to blending it with the heated air. A temperature control determines the discharge air temperature by operating the blend door actuator, which moves the blend-air doors. This allows an almost immediate control of the output air temperature of the system. The two mode door actuators operate the mode-air doors which direct the flow of the conditioned air out the various air outlets, depending on the mode selected. The recirculation door actuator operates the recirculation-air door which closes off the fresh air intake and recirculates the air already inside the vehicle. The blower motor controls the velocity of air flowing through the HVAC housing assembly by spinning the blower wheel within the HVAC housings at the selected speed by use of the blower motor resistor.

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