Dodge 2004 Caravan Owner's Manual page 211

Panel Mode
Air comes from the outlets in the instrument panel. Each
of these outlets can be individually adjusted to direct the
flow of air. Moving the air vane knob on the center
outlets down, will close off the air flow from the center
UNDERSTANDING YOUR INSTRUMENT PANEL 211
outlets. The thumbwheel next to the outboard outlets can
be rotated to regulate or shut off the air flow from these
outlets.
Bi-Level Mode
Air comes from both the instrument panel outlets, floor
outlets and defrost. A slight amount of air is also directed
through the side window demister outlets.
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