Control Assembly: Description and Operation

The operation of the A/C system is controlled by the switch and levers on the control assembly. The compressor clutch and blower are connected electrically to the control assembly by a wiring harness. The blower circuit is open in the "OFF" mode. In all other modes the blower has 4 speeds to control the amount of air flow.

Temperature is controlled by the position of the temperature lever on the control assembly. A SAF-adjusting cable connects this lever to the temperature valve. It controls air flow through the heater core. As the temperature lever is moved through its full travel, a sliding clip on the cable at the temperature valve connection assures that the temperature valve will seat in both extreme positions. The position of the temperature door is independent of mode selection. The temperature cable attaches to the right side of the A/C module.

The remaining functional assemblies are controlled by the vacuum valve linked to the mode lever of the control assembly. This valve controls the supply of engine vacuum to the appropriate vacuum actuator(s) for the mode selected.

See wiring diagrams and diagnosis for the A/C electrical and vacuum system.