2003 GMC Envoy Owner's Manual - Page 149

Q* +d (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. Driver's Side Temperature Knob: Turn this knob clockwise or counterclockwise to manually raise or lower the temperature on the driver's side of the vehicle. The display will show the temperature setting decreasing or increasing and the word "DRIVER" will light up. This knob can alsoadjust the passenger's side temperature setting simultaneously if the two zones are linked. The words "DRIVER and PASS'' will then light up. Passenger's Side Temperature Knob: Turn this knob clockwise or counterclockwise to manually raise or lower the temperature on the passenger's side of the vehicle. The display will show the temperature setting decreasing or increasing and the word "PASS'' will light up. The passenger's temperature setting can be set to match and link to the driver's temperature setting by pressing and holding the AUTO button for three seconds. By adjusting the driver's side temperature setting, the passenger's side temperature setting will follow and both "DRIVER and PASS" will be displayed. The passenger's side temperature setting also resets and relinks to the driver's side temperature setting if the vehicle has been off for more than two hours. Automatic Operation AUTO (Automatic): When automatic operation is active, the system will control the inside temperature, the air delivery mode, and the fan speed. Use the steps below to place the entire system in automatic mode: 1. Press the AUTO button. When AUTO is selected, the air conditioning operation and air inlet will be automatically controlled. The air conditioning compressor will run when the outside temperature is over approximately 40°F (4°C). The air inlet will normally be set to outside air. If it's hot outside, the air inlet will automatically switch to recirculate inside air to help quickly cool down your vehicle. 2. Set the driver's and passenger's temperature. To find your comfort setting, start with a 72°F (22°C) temperature setting and allow about 20 minutes for the system to regulate. Turn the driver's or passenger's side temperature knob to adjust the temperature setting as necessary. If you choose the temperature setting of 60°F (15°C)' the system will remain at the maximum cooling setting. If you choose the temperature setting of 90°F (32°C)' the system will remain at the maximum heat setting. Choosing either maximum setting may not cause the vehicle to heat or cool any faster. 3-24