A/C Defrost Valve

The A/C Defrost Valve is controlled by the A/C Defrost Valve Vacuum Actuator. When the Mode Selector is in "MAX," "NORM," "BI-LEVEL" or "VENT," vacuum is applied through the RED hose to the A/C Defrost Valve Vacuum Actuator. This pulls the A/C Defrost Valve to position B and prohibits air from entering the Defroster Outlet.

If the Mode Selector is in "HEATER" or "DEFROST." no vacuum is applied and the A/C Defrost Valve moves to position A, thereby forcing the air out the Defroster Outlet.