1997 GMC Sonoma Owner's Manual - Page 117

Optional Climate ControlSystem I r r I 0 OF U to Mode Knob The lower knob allows you to choose the direction of air delivery. OFF: This setting turns the system off. Some outside air will still enter the vehicle whenever the vehicle is moving forward. MAX A/C: This setting provides maximum cooling with the least amount of work. MAX A/C recirculates much of the air insideyour vehicle so it cools quickly. A/C: This setting coolsthe air enteringyour vehicle and directs it through the instrument panel outlets. BI-LEVEL A/C: Air is delivered through the heater floor outlets as well as the instrument panel outlets. +# e +a Fan Control The switch with the fan symbol changes the fan speed. To increase the fan speed, move the switch upward toward HI. To decrease the fan speed, move the switch downward toward LO. VENT This setting directs airflow through the instrument panel outlets. The air conditioning compressor is not working when VENT is selected. HEATER: This setting directswarmed air through the heater floor outletsand windshield defroster outlets. /J 0 +# a Temperature Knob The upper knob regulates the temperature of the air coming through the system. Turn the knob clockwise for warmer air. Turn the knob counterclockwise for cooler air. w., BLEND: Airflow is divided equally between the + heater floor outlet and the windshield defroster outlets. DEFROST This settingdirects most air through the windshield defroster outletsand some through the heater outlets. 3-3