GMC 1997 Savana Van Owner's Manual page 129

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