A/C Heat Valve

The A/C-Heat Valve Vacuum Actuator, which controls the A/C-Heat Valve, is bidirectional. 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 and no air flows from the Floor Outlets.

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