Vacuum Electrical Solenoid Description

The heater and A/C vacuum solenoid operates the vacuum actuators to control the following functions:
^ The air intake
^ The discharge locations

Inside the A/C solenoid switch assembly are 4 solenoid-actuated vacuum valves that respond to the heater and A/C control electrical signals. The vacuum valves vent or supply the vacuum to the vacuum actuators. By energizing various valve combinations, the heater and A/C control determines whether the air is directed to the following locations:
^ The floor outlets
^ The panel outlets
^ The defroster outlets

The heater and A/C control also determines the following conditions:
^ Whether outside air draws into the system
^ Whether inside air recirculates