2007 GMC Acadia Owner's Manual - Page 211

Rear Air Conditioning and Heating System If your vehicle has this system, the rear controls are three knobs located on the rear of the center console. The system can be controlled from the front controls as well as the rear controls. To turn the system on, press the AUX button on the front climate control system, an indicator will be lit. Pressing the AUX button the first time will turn the rear system on in a mimic mode. In this mode, the airflow in the rear will be approximately the same direction, temperature, and fan speed as the front. Pressing the AUX button again will turn the rear system and the indicator off. If the rear controls are adjusted, the system turns on in a rear independent mode. Airflow in the rear will then be directed according to the settings of the rear controls. The rear system can be turned off by pressing the AUX button on the front climate control system and the indicator will turn off. The system can be turned back on, by adjusting any of the rear air conditioning control knobs. 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. 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. 211