2002 GMC Envoy Owner's Manual - Page 179

Fan Switch The switch with the fan symbol allows you to manually adjust the fan speed. Press the up arrow to increase fan speed and the down arrow to decrease fan speed. MODE Button Press this button to manually select the air delivery mode to the floor, panel or windshield outlets. The system will stay in the selected mode until the MODE button is pushed again or the AUTO button is pushed. Display In full AUTO mode, the automatic climate control system display will show the outside temperature, labeled EXT for external temperature, and AUTO. If you press the MODE button to select an air delivery mode, the display will change to also show you the current system mode. If you press the up or down arrows on the fan switch, the display will change to show the selected fan speed. After five seconds, the display will change to show the EXT temperature and the selected manual setting. Automatic Operation Press the AUTO button to set the system to automatically control the air delivery mode, fan speed, air temperature and recirculation operations. Whenever you press AUTO, the display will change to show the current driver's set temperature, automatic air delivery mode and fan speed. Press the AUTO button again within five seconds and the display will show the passenger's set temperature. After five seconds the display will change to the EXT (external) temperature outside the vehicle. When AUTO is selected, the air conditioning operation and air inlet will be automatically controlled. The air conditioning compressor will run when 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 recirculated inside air to help quickly cool down your vehicle. 3-5