2010 GMC Acadia Owner's Manual - Page 250

8-6 Climate Controls PASS (Passenger): Press to set the passenger temperature to match the driver temperature setting. The PASS indicator will turn off. When the passenger temperature setting is different than the driver setting, the PASS indicator comes on. Manual Operation The air delivery mode or fan speed can be manually adjusted. H / G (Air Delivery Mode Control): Press to change the direction of the airflow in the vehicle. Repeatedly press H or G until the desired mode appears on the display. Pressing a mode button while the system is off changes the air delivery mode without turning the system on. Press a mode button while in automatic control to place the system into manual control. The air delivery mode setting still displays, but the word AUTO no longer displays, and the AUTO button indicator light turns off. 6 (Floor): Air is directed to the floor outlets, with some of the air directed to the windshield, side window, and second row floor outlets. In this mode, the system uses outside air. D / C (Fan Control): Press to increase or decrease the fan speed. Pressing D or C while in automatic control places the fan speed under manual control. The air delivery mode remains in automatic control. The fan setting still displays, but the word AUTO no longer displays, and the AUTO button indicator light turns off. H (Vent): Air is directed to the instrument panel outlets. ) (Bi-Level): Air is divided between the instrument panel and floor outlets. Some air is directed towards the windshield and side window outlets. Cooler air is directed to the upper outlets and warmer air to the floor outlets. - (Defog): This mode clears the windows of fog or moisture. Air is directed to the windshield, floor outlets, and side window vents. When this mode is selected, the system turns off recirculation and runs the air conditioning compressor unless the outside temperature is less than 4°C (40°F). Do not drive the vehicle until all the windows are clear.