2000 GMC Envoy Owner's Manual - Page 139

Comfort Controls With this system, you can control the heating, cooling and ventilation in your vehicle. OFF: If the knob is in OFF, outside air will still enter the vehicle, and will be directed based on the position of the mode knob. AUTO: If the knob is in AUTO, the fan speed will vary as the system maintains the selected temperature. Temperature Knob The middle knob on the control panel lets you select the desired air temperature in your vehicle. This knob will allow you to adjust the interior air temperature independently of the function knob setting. Turn the knob clockwise toward 82 for warmer air. Turn the knob counterclockwise toward 66 for cooler air. Full Hot: If you turn the temperature knob past 82_F (28_C), the system will go into the "full hot" mode. The system will remain at that maximum heating setting and the fan will blow at the speed the fan knob is set to. 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 system will go into the "full cold" mode. The system will remain at that maximum cooling setting and the fan will blow at the speed the fan knob is set to. If the fan is in AUTO, it will run at full speed. Choosing either maximum setting will not cause the system to heat or cool any faster. Electronic Climate Control System Fan Control The knob on the left side of the climate control panel controls the fan speed. To manually increase airflow, turn the knob clockwise. To manually decrease airflow, turn it counterclockwise. 3-2