1998 GMC Savana Van Owner's Manual - Page 140

A/C: Use for normal cooling on hot days.This setting cools outside air and directs it through the instrument panel outlets. BI-LEVEL A/C: Use this setting to divide aifflow between the heaterfloor vents and instrument panel vents. The air conditioning compressor may operate in this setting to cool the air. instrument panel vents. 0 ' *a +a HEAT This setting directs air through the heater floor vents. This setting is useful for coldweather. +' / I VENT: This setting directs air through the . w HEATDEFROST: Use this setting to divide . +# airflow between the heater floor vents and windshield. DEFROST: This setting directs air through the windshield defroster vents. This setting is useful when you have fog orice on the windshield. To increase and decrease the flow of heated air to the rear floor vents, move theswitch marked REAR HEAT to the blower speed you want. The knob has three speed positions.To increase the flow HIGH. To turn the of heated air, move the switch toward fan off, move the switchto OFF. Rear Heater (Without Air Conditioning) If you have a rear heater (without rear air conditioning), the control switch is located on the instrument panel. 3-4