1998 GMC Envoy Owner's Manual - Page 135

Comfort Controls With this system, you can control the heating, cooling and ventilation in your vehicle. I AUTO: If the knob isin AUTO, the fan speed will vary as the system maintains the selected temperature. Temperature Knob The middle knob the control panel lets you select the on desired air temperaturein your vehicle. This knobwill allow you to adjust the interior air temperature independently of the function knobsetting. Turn the knob tothe right toward 82 for warmer air. Turn the knob to the left toward 66 for coolerair. Electronic Climate Control System Full Hot: If you turn the temperature knob past 82°F hot" mode. The (2SoC), the system will go into the "full system will remain at that maximum heating setting and the fan will blow at the speed thefan knob is setto. If the fan is in AUTO, it will run at full speed. Full Cold:If you turn the temperature knob past 66°F (19"C), the systemwill go intothe "full cold"mode. The systemwill remain at that maximum cooling setting and the fan will blow at the speed the fan knob is setto. If the fanis in AUTO, it will run at full speed. Choosing either maximum setting will not cause the system toheat or coolany faster. Fan Control The knobon the left side of the climate controlpanel controls the fan speed. To manually increaseairflow, move the knob to the right. To manually decrease airflow, move it to the left. OFF: If the knob is in OFF, outside air will still enter the vehicle, andwill be directed based on the position of the mode knob. 3-2