2006 GMC Envoy Owner's Manual - Page 167

Dual Automatic Climate Control System Your vehicle may have the dual automatic climate control system. With this system you can control the heating, cooling and ventilation for your vehicle. Outside Air Temperature Display A new outside temperature reading will be displayed if the vehicle has been off for more than three hours. If the vehicle has been off for less than three hours, the old temperature reading may be displayed because underhood heat is affecting the true outside temperature. Since underhood heat can also affect the outside temperature while the engine is running, it may take several minutes of driving before the display updates to the actual outside temperature. 9 (Off): Press this button to turn off the entire climate control system. Outside air will still enter the vehicle, and will be directed to the floor. Press the AUTO button, the mode button, the fan arrows, or either temperature knob to turn the system on. When your vehicle is first started and the climate control system is on, or if the climate control system has been turned on, the display will show the driver's temperature setting for five seconds. Then it will show the outside temperature. C (Mode): Press this button to manually select the air delivery mode to the floor, instrument panel, or windshield outlets. The system will stay in the selected mode until the mode button is pressed again or the AUTO button is pressed. 3-23