Outside Air Valve

When the Mode Selector is moved to "MAX," vacuum is applied to the Outside Air Valve Vacuum Actuator. The bellows are drawn in and the valve is moved to position B. Air from inside the car is pulled into the A/C Module.

In any other position of the Mode Selector, no vacuum is applied and the vacuum actuator bellows are expanded. The Outside Air Valve is then in position A. This opens the Outside Air Inlet and lets outside air into the A/C system.