RECIRCULATION Operation
WARNING: This page is about a different car, the 2002 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
When the operator presses the recirculation switch, 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. The recirculation operation can function with blower motor in either the ON or OFF position. Recirculation will continue and the LED will illuminate until either outside air is selected or the next ignition cycle. Recirculation is not available in DEFROST and MIX-BLEND mode.