2003 GMC Yukon Owner's Manual - Page 186

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 your windows. Rear Air Conditioning System If your vehicle is equipped with the optional rear air conditioner it has two rear air conditioning fan speed selectors. One fan speed selector is located in the overhead console and the other is located in the headliner above the second row seats. • Keep the air path under the front seats clear of objects. This helps air to circulate throughout your vehicle. • Adding outside equipment to the front of your vehicle, such as hood-air deflectors, etc., may affect the performance of the heating and air conditioning system. Check with your dealer before adding equipment to the outside of your vehicle. Front Control To increase and decrease the flow of cooled air to the rear vents, turn the knob to the fan speed you want. The knob has three speed positions. To increase the flow of cooled air, turn the knob clockwise. To decrease the flow of cooled air, turn it counterclockwise. To turn the fan off, turn the knob to the off position. 3-32