1999 Chevrolet Express Van Owner's Manual - Page 135

yellowblue Fan Knob HEAT/DEFROST: Use this setting to divide airflow between the heater floor vents and windshield. DEFROST: This setting directs air through the windshield defroster vents. This setting is useful when you have fog or ice on the windshield. The knob on the left side of the heating system control panel controls the fan speed. The knob has four speed positions. To increase airflow, turn the knob toward HI. To decrease airflow, turn it toward LO. To turn the fan off, turn the mode knob on the far right to OFF. Temperature Knob The middle knob on the control panel lets you select the relative temperature of the air flowing into the passenger area of your vehicle. This knob will allow you to adjust the relative air temperature independently of the function knob setting. Turn the knob toward the red area for warmer air. Turn the knob toward the blue area for cooler air. Mode Knob The right knob on the control panel changes the heater/air conditioning setting. MAX A/C: Turn the right knob to MAX A/C for maximum cooling. This setting puts the system in the recirculation mode and helps to maximize your air conditioner's performance and your vehicle's fuel economy. This setting also cools the air the fastest. After the vehicle's interior reaches a comfortable temperature, turn the knob clockwise to place the air conditioning system in the A/C mode. Heater/Air Conditioning Controls If your vehicle has air conditioning, your heater/air conditioning controls will look like this. Before using your vehicle's air conditioning, open the windows to clear the vehicle of hot air. 3-3