1998 GMC Safari Owner's Manual - Page 155

BI-LEVEL: This setting bringsin outside air and blowsit out throughthe heater floor vents and the instrument panel vents. you move the temperature If knob between hot and cold, cooler air will comeout of the upper vents while warmer comes outof the floor air vent. The air conditioning compressor may operate in this setting to cool air. the +# +a Heating System I / I VENT: The air comesout at the ventson your I instrument panel.The air conditioning compressor will not runin this position. Adjust the temperature knob for warmer or cooler air. I. , + ' , HEATER: Most of theair comes out near the w floor. The rest comesout from the defroster vents under the windshield and at front side windows. the If your vehicle does not have air conditioning, your heater controls will look like this. BLEND: With this setting, the heated outside air comes out both the heater vents and defroster vents. Adjust the temperature knob warmer or cooler air. for The air conditioning compressor may operate in this setting to dehumidify the air. DEFROST: This setting operates the defroster. Most of the air comes out near the windshield, with some going to the floor vents and side windows. front The air conditioning compressor may operate in this setting to dehumidify the air. 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 knobis next to the fan knob. It selects the temperature of the air flowing into your vehicle. Move the knob toward the right warmer air. Move the knob for toward the left for cooler air. 3-3