The heater and A/C vacuum solenoid operates the vacuum
actuators to control the following functions:
| • | 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 defroster outlets |
The heater and A/C control also determines the following conditions:
| • | Whether outside air draws into the system |
| • | Whether inside air recirculates |
