1997 Chevrolet Express Van Owner's Manual - Page 131

For warmer air, turn the knob clockwise toward the red side, and for coolerair, turn the knob counterclockwise toward the blue side. To regulate the airflow location, adjust the center knob on the control panel. Turn the knob counterclockwise for floorvent airflow or clockwise for headliner vent airflow. Generally, the upper vents are used for air conditioning and the floor ventsfor heating. The control knob can be set to any blend setting. To adjust the airflow speed, turn the fancontrol knob on the left side of the control panel to the desired blower setting. To activate the rear control, move the fan knob on the front control to REAR CNTL. Rear Passenger Control The rear control works just like the front control. It will allow second seat passengers to adjust the controls as they desire. 3-6