Auxiliary Air Delivery
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
The optional auxiliary HVAC system allows the driver to adjust the amount of air directed to the rear of the vehicle using the front mode switch. To direct air to the rear of the vehicle using the floor vents, set the mode switch on the HVAC control module to the BI-LEVEL, FLOOR, DEFROST or MIX-BLEND modes. To direct air through the headliner vents, set the mode switch on the HVAC control module to the VENT or MAX modes.