1996 GMC Safari Owner's Manual - Page 127

Heating System Function Knob This knob is next to the temperature knob. The function knob allows you to choose the direction of air delivery. OFF: This setting turns the system off. /J VENT The air comes out at the vents on your instrument panel. -0 BI-LEVEL: With this setting, the heated outside air comes out both the instrument panel vents and heater vents. Adjust the temperature knob for warmer or coolerair. If your vehicle does not have air conditioning, your heater controls will look like this. +fl +* Most of the air comes out near the floor. The rest comes out from the defroster vents under the windshield and at the front side windows. +" HEATER: Fan Knob This control has four positions. To increase airflow, turn the knob toward HI. To decrease airflow, move it toward LO. % +# BLEND: With this set.ting,the heated outside air comes out both the heater vents and defroster vents. Adjust the temperature knob for warmer or coolerair. 9DEFROST This setting operates the defroster. Most of the air comes out near the windshield, with some going to the floor vents and front side windows. 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