Recirculation Operation
WARNING: This page is about a different car, the 2002 Pontiac Sunfire and 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
When the operator selects RECIRCULATION, a solenoid inside the HVAC control assembly connects the recirculation door vacuum actuator to the vacuum source. The recirculation actuator retracts, closing the recirculation door. A/C is forced ON. The recirculation operation can function with blower motor in either the ON or OFF position. Recirculation is not available in DEFROST and MIX-BLEND mode.