Chrysler 2008 Pacifica - Manual (Page 254)

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 lever positions, the bi-
level mode is designed to provide cooler air out of the
panel outlets and warmer air from the floor outlets.
Bi-Level Outlets
254 UNDERSTANDING YOUR INSTRUMENT PANEL