Mode Selector Knob
WARNING: This page is about a different car, the 1998 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Mode selector knob can be placed in PANEL, PANEL & FLOOR, OFF, FLOOR, FLR & DEF (floor and defrost) and DEF (defrost) positions. Mode selector knob position determines which mode doors are open, partially open or closed. Mode doors direct airflow to selected outlets. The 3 vacuum motors and doors are outside/recirculation, panel/defrost and floor/defrost. See Figure.