Max A/C

When the operator selects MAX A/C, the mode actuator has vacuum applied to it through the Yellow vacuum line, making the vent door open. The defrost actuator has vacuum applied to it through the Blue Vacuum line, making the defrost door close and the heater door open through mechanical linkage. A solenoid inside the HVAC control assembly connects the recirculation door vacuum actuator to the vacuum source. The recirculation actuator retracts, allowing air to be recirculated. A/C is forced ON.