2001 GMC Sierra 1500 Pickup Owner's Manual - Page 198

Rear Air Conditioning and Heating Systems with Electronic Climate Control System (If Equipped) With this system the rear passengers can control the temperature of the air flow for his/her own zones. The climate control has three controls. To adjust the airflow speed, turn the fan knob located on the left side of the control panel to the desired fan speed. The system also has a front AUTO setting that can automatically change the temperature of the rear seating area based on information from the front control. An OFF setting, located on the front climate control panel, also allows the driver to turn off the rear passenger seat controls from the front seat. To adjust the air temperature, turn the temperature knob on the center of the control panel. Front Control For warmer air, turn the knob clockwise toward 82_F (28_C). Turn the knob counterclockwise toward 66_F (19_C) for cooler air. To regulate the airflow location, adjust the right knob on the control panel. Turn the knob clockwise for floor vent airflow or counterclockwise for headliner vent airflow. Generally, the upper vents are used for air conditioning and the floor vents for heating. The knob can be set to any blend setting. For rear control operation, use the above instructions. Rear Control 3-11