Blower Control Knob
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2002 BMW Z3, 2002 BMW M Roadster, 2002 BMW M Coupe, 2001 BMW Z3, and 2001 BMW M Roadster. However, it is still accessible from the selected car via links, so may be relevant.
Blower speed can be placed in 5 different levels from off (0) to high speed setting (4). The airflow to vent outlets is dependent on driving speed. See Figure .