GMC 1997 Safari Owner's Manual page 149

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BI-LEVEL: This setting brings in outside air
through the heater floor vent and the instrument panel
vents. If you move the temperature knob between hot
and cold, cooler air will come out of the upper vents
while warmer air comes out of the floor vent. The air
conditioning compressor may operate in this setting to
cool the air.
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VENT: The air comes out at the vents on your
instrument panel. The air conditioning compressor will
not run in this position. Adjust the temperature knob for
warmer or cooler air.
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HEATER: 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.
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BLEND: With this setting, the heated outside air
comes out both the heater vents and defroster vents.
Adjust the temperature knob for warmer or cooler air.
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DEFROST: 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.
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Heating System
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.
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