2008 GMC Acadia Owner's Manual - Page 179

Mode Knob The right knob on the control panel lets you choose the direction of the air flow. H (Vent): This setting directs the air through the headliner outlets. ) (Bi-Level): This setting directs the air through the rear floor outlets under the third row seat, as well as the headliner outlets. The flow can be divided between headliner and floor outlets depending upon where the knob is placed between the settings. This setting directs the air through the floor outlets. The rear system floor outlets are located under the third row seats. Fan Knob Turn the left knob clockwise or counterclockwise to increase or decrease the fan speed. Turn the knob all the way counterclockwise to turn the rear system off. 6 (Floor): Temperature Knob The middle knob on the control panel lets you select the temperature of the air flowing into the passenger area. Turn the knob clockwise or counterclockwise for warmer or cooler air. 3-37