2007 GMC Sierra 1500 Pickup Owner's Manual - Page 235

Dual Automatic Climate Control System With this system, you can control the heating, cooling, and ventilation in your vehicle. Your vehicle also has a flow-through ventilation system described later in this section. 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. You can select different climate control settings for the driver and passengers. 235