Air Distribution System Description: Notes
WARNING: This page is about a different car, the 1999 GMC Sierra and 1999 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The electronically-actuated doors control airflow. At various positions of the rotary knobs on the control assembly, the mode doors mix and direct cooled, heated, and outside air through the air distribution duct.