Blower Speed Thumbwheel
WARNING: This page is about a different car, the 1996 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
Rotating thumbwheel more than 10 degrees will provide manual control of blower speed. Rotating thumbwheel fully downward will lock blower speed in slowest speed. Rotating thumbwheel fully upward will lock blower speed in fastest speed. Pushing AUTOMATIC button will resume automatic operation.