1997 Chevrolet Express Van Owner's Manual - Page 128

Mode Knob The right knob changes the heater setting. Heater/Air Conditioning Controls /J VENT This setting directs airthrough the instrument panel vents. airflow between the heater floorvents and instrument panel vents. *a '# +e BI-LEVEL: Use this setting to divide +# e HEAT This setting directs airthrough the heater floor vents. This setting is useful for cold weather. HEATDEFROST Use this setting to divide airflow between the heater floor ventsand windshield. +', w a DEFROST: This setting directs air through the windshield defroster vents. This setting is useful when you have fog or ice the windshield. on If your vehicle has air conditioning,your heatedair conditioning controlswill look like this. Before using your vehicle's air conditioning,open the windows to clear the vehicle of hot air.