Dodge 2007 Caravan - Manual (Page 292)

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
outlets. The thumbwheel next to the outboard outlets can
be rotated to regulate or shut off the air flow from these
outlets.
Panel Outlets
292 UNDERSTANDING YOUR INSTRUMENT PANEL