1995 GMC Sonoma Owner's Manual - Page 117

The lower knob selects the heater or air conditioningfunction and determines which outlets the air will flow through (instrument panel, defroster, heater, etc.). OFF - This setting turns off all heating functions. Some outside air will still come out of the heater outlet wheneverthe vehicle is moving forward. MAX A/C - Air inside your vehicle is recirculated to maximize your air conditioner's performance and your vehicle's fuel economy. This setting cools the air the Fastest and should be used to keep "unwanted odors" and/or dust from entering the vehicle. NORM A/C -This setting cools outside air directs it through the and instrument panel vents. This setting is useful for normal cooling on hot days. BI-LEV A/C - Air is delivered through the heater floor vents as well as the instrument panel vents. This setting is useful in cool weather with bright sunlight. VENT - Airflow is through the instrument panel vents. Set the upper knob to the temperature desired. This setting useful for mild outside is temperatures, when little heating or cooling is desired. The air conditioner does not run. HEAT - Heated air comes outthrough the heater floor vents and windshield defroster vents. This setting is useful for cold weather. BLEND - Airflow is divided equally between the heater floor vent and the windshield defroster vents. This setting is useful in cool weather when you have fog or ice on the windshield or side windows. DEF - This setting directs most air through the windshield defroster vents and some through the heater vents. This setting is useful when you have fog or ice onthe windshield. Engine Coolant Heater (Option) If you use the optional engine coolant heaterbefore starting your engine, your heating system will produce warmer air faster, to heat the passenger compartment in cold weather. See "Engine Coolant Heater" in the Index. 3-3