Temperature Control System

TEMPERATURE CONTROL SYSTEM
The temperature control system is dependent upon the interaction of many electronic components. In the following paragraphs the location and a brief description of the operation of these components are given.

CONTROL SYSTEM COMPONENTS (Air Conditioning Programmer (ACP))
The ACP is attached to the HVAC module assembly behind the glove box and can be identified by the electrical and vacuum connectors attached to it. Within the case are the functional components described below. The ACP provides the controls for temperature regulation.

The ACP controls a small DC motor that adjusts the air mix valve position to blend cold and warm air. The motor is reversible and moves a rotary shaft which drives the air mix valve link. The motor also provides a position sensor signal to monitor actual valve position.

The ACP also responds to operate the four vacuum solenoids. The solenoids control vacuum to the various vacuum actuators which in turn control the air inlet (recirc.) valve, A/C DEFROST valve and the UP-DOWN valve.

AIR MIX VALVE LINKAGE
The air mix valve linkage consists of a plastic crank arm integral with the output shaft of the programmer motor, a serrated nylon retainer, and a threaded rod. One end of the rod is fastened to the air mix valve and the opposite end is retained by the serrations in the nylon retainer. The ACP uses an internal motor to drive the air mix valve (door).