A/C-Heater Valve

The A/C-Heat Valve Vacuum Actuator, which controls the A/C-Heat Valve, is bi-directional. The actuator is operated by two bellows and two vacuum switches. With the Mode Selector in "MAX," "NORM" and "VENT" vacuum is applied through the YELLOW hose, moving the A/C-Heat Mode Valve to position A. Air flow is directed to the Instrument Panel Outlets with some air bleed to the Floor, Windshield and Side Window Outlets.

The A/C-Heat Valve Vacuum Actuator has vacuum applied to it through RED hose with the Mode Selector in "OFF" "HTR," "BLEND" and Defrost. The valve is then moved to position C and all air is directed to the Floor, Windshield or Side Window Outlets, depending on the Mode Selector position. When the Mode Selector is in "B/L," neither bellows is under vacuum and the A/C-Heat Valve Vacuum Actuator moves to the Mid-Position. Air is then directed to the Instrument Panel Air Outlets and the Floor, Windshield or Side Window Outlets, depending on the Mode Selector position.