2006 GMC Yukon Owner's Manual - Page 186

Driver's Side Temperature Knob The driver's side knob is used to adjust the temperature of the air coming through the system on the driver's side. The temperature can be adjusted even if the system is turned off. This is possible since outside air will always flow through the system as the vehicle is moving forward unless it is set to recirculation mode. See "Recirculation" later in this section. Turn the knob counterclockwise or clockwise to lower or increase the cabin temperature. The display will show the temperature setting decreasing or increasing and an arrow pointing to the driver will be displayed under and to the left of the temperature setting. Passenger's Side Temperature Knob The passenger's side knob can be used to change the temperature of the air coming through the system on the passenger's side of the vehicle. The temperature can be adjusted even if the system is turned off. This is possible since outside air will always flow through the system as the vehicle is moving forward unless it is set to recirculation mode. See "Recirculation" later in this section. Turn the knob counterclockwise or clockwise to lower or increase the temperature inside the vehicle. The display will show the temperature setting decreasing or increasing and an arrow pointing to the passenger will be displayed under and to the right of the temperature setting. The passenger's temperature setting can be set to match the driver's temperature setting by pressing and holding the AUTO button for four seconds. Both the driver and passenger arrows will be displayed. 3-26