1997 Chevrolet Astro Owner's Manual - Page 149

BI-LEVEL: This setting brings in outside air through the heater floor vent and the instrumentpanel vents. If you move the temperature knobbetween hot and cold, cooler airwill come out of the upper vents while warmer air comesout of the floor vent. The air conditioning compressor may operate in this setting to cool the air. +. +# +e Heating System /J VENT: The air comes outat the vents on your instrument panel. The air conditioning compressor will not run in this position. Adjust the temperature knob for warmer or coolerair. HEATER: Most of the air comes out near the floor. The rest comes out from the defroster ventsunder the windshield and at the front side windows. w e BLEND: With this setting, the heated outside air comes out both the heater vents and defroster vents. Adjust the temperature knob for warmer or coolerair. DEFROST This setting operatesthe defroster. Most of the air comes out near the windshield, with some going to the floor vents and front side windows. +' +' 0 If your vehicle does not have air conditioning, your heater controls will look like this. Fan Knob This control has four positions. To increase airflow, turn the knob toward HI. To decrease airflow, move it toward LO. Temperature Knob This knob is next to the fan knob. It selects the temperature of the air flowing into your vehicle. Move the knob clockwise for warmer air. Move the knob counterclockwise for cooler air. 3-3