2009 GMC Yukon Owner's Manual - Page 215

Outlet Adjustment Use the air outlets located in the center and on the side of the instrument panel to direct the airflow. Rear Air Conditioning and Heating System For vehicles with this system, the rear controls are three knobs located in the headliner. The system can also be controlled with the front controls. Operation Tips • Keep the hood and front air inlets free of ice, snow, or any other obstruction (such as leaves). The heater and defroster will work far better, reducing the chance of fogging the inside of the windows. • When you enter a vehicle in cold weather, press the fan up button to the maximum fan level before driving. This helps clear the intake ducts of snow and moisture, and reduces the chance of fogging the inside of the window. • Keep the air path under the front seats clear of objects. This helps air to circulate throughout the vehicle. • Adding outside equipment to the front of the vehicle, such as hood-air deflectors, may affect the performance of the heating and air conditioning system. Check with your dealer/retailer before adding equipment to the outside of the vehicle. A. Fan Control B. Temperature Control C. Air Delivery Mode Control REAR: Press the REAR button on the front climate control system to turn the rear climate control system on or off. An indicator comes on when the rear system is on. See Climate Control System on page 3-22 or Dual Automatic Climate Control System on page 3-25. The rear system can also be turned off by turning the rear fan knob to the 9 position. 3-31