Recirculation Valve

The Recirculation Valve Vacuum Actuator has no vacuum applied for every Mode Selector position except for "MAX." The actuator bellows are expanded. The Recirculation Valve is in position A. This opens the Outside Air Inlet and lets outside air into the Plenum.

When the Mode Selector is moved to "MAX," vacuum is applied to the Recirculation Valve Vacuum Actuator. The bellows are drawn in and the valve is moved to position B. Air from inside the vehicle is pulled into the Plenum.