Chrysler 2004 Town and Country - Manual (Page 222)

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.
NOTE: In many temperature positions, the bi-level
mode is designed to provide cooler air out of the panel
outlets and warmer air from the floor outlets.
Floor Mode
Air comes from the floor outlets. A slight amount of air is
directed through the defrost and side window demister
outlets.
222 UNDERSTANDING YOUR INSTRUMENT PANEL