2003 GMC Yukon Owner's Manual - Page 190

Front Controls The overhead control has three knobs that control airflow speed, temperature and airflow location. To adjust the airflow speed turn the knob located on the left side of the control panel. To adjust the air temperature turn the temperature knob on the center of the control panel to increase or decrease the temperature. To regulate airflow location adjust the right knob on the control panel. The system also AUTO settings that can automatically control the fan speed and/or mode of the air delivery to the rear seating area. Rear Controls The rear seat controls have the following settings: O (On/Off): %(Mode): Press this button to turn the rear seat comfort controls on or off. Press this button to select the air delivery, and setting, and AUTO mode. 9 (Off): An off setting, located on the overhead climate control panel also allows the driver to turn off the rear seat passenger seat controls from the front seat. b (Temperature): Press this button up or down to increase or decrease the temperature setting. w9x(Fan): the fan speed. Press this button up or down to adjust 3-36