Airflow Control
WARNING: This page is about a different car, the 1998 Chevrolet Monte Carlo and 1998 Chevrolet Lumina. However, it is still accessible from the selected car via links, so may be relevant.
Air temperature valve (temperature door) is controlled by an electric actuator. See Figure or Figure . All other doors are controlled by vacuum actuators. Vacuum supply to actuators is controlled by solenoids inside of vacuum/electric solenoid assembly, located near blower motor. Solenoids respond to inputs from A/C-heater control panel.