2004 Chevrolet Tahoe Owner's Manual - Page 190

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. To operate the rear system using the front control, just turn the knob to the fan position you want. Rear Control To use the rear control, first turn the front control to the AUX position. Then, the rear control can be used to increase and decrease the airflow. 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. 3-34