Recirculation Mode

When the recirculation switch is pressed, a signal is sent from the heater and A/C control to the recirculation vacuum solenoid valve, through the vacuum solenoid valve control circuit. Power is supplied to the recirculation vacuum solenoid valve through the battery positive power supply circuit. When the recirculation vacuum solenoid valve is grounded, vacuum is applied to the recirculation actuator. The recirculation valve allows air from the passenger compartment to be recirculated through the HVAC module.

When outside air mode is selected, the recirculation actuator is vented to normal air pressure and the recirculation valve completely closes off the entrance for inside air.

Recirculation is helpful when you are trying to cool the air quickly or trying to limit odors from entering the vehicle. When the system is in the AUTO mode, the system automatically selects recirculation to cool the vehicle's temperature. The recirculation mode will not operate in the front defrost mode, as to prevent windshield and window fogging due to moisture in the vehicle.

When manually selected, recirculation will stay on until either the vehicle operator selects outside air, by pressing the recirculation switch, or the HVAC control module automatically moves the recirculation actuator. When selected, the recirculation icon will illuminate on the VF display. Recirculation is available in all modes except front defrost.