2008 GMC Acadia Owner's Manual - Page 178

Outlet Adjustment Use the slider switch in the center of the outlet, to change the direction of the air flow. Use the thumbwheel near the outlet to control the amount of air flow or to shut off the airflow completely. Keep all outlets open whenever possible for best system performance. 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. Operation Tips • Clear away any ice, snow, or leaves from the air inlets at the base of the windshield that can block the flow of air into the vehicle. • Use of non-GM approved hood deflectors can adversely affect the performance of the system. • Keep the path under all seats clear of objects to help circulate the air inside the vehicle more effectively. • If fogging reoccurs while in vent or bi-level modes with mild temperature throughout the vehicle, turn on the air conditioner to reduce windshield fogging. 3-36