Fresh/Recirculated Air Control
WARNING: This page is about a different car, the 2001 Chevrolet Malibu and 2000 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
Fresh/recirculated air feature is controlled using appropriate switch on A/C-heater control panel. Switch controls a solenoid which directs vacuum to vacuum actuator that moves recirculation valve.