2004 GMC Sonoma Owner's Manual - Page 122

Climate Controls Climate Control System With this system you can control the heating, cooling and ventilation for your vehicle. ) (Bi-Level): This mode directs half of the air to the instrument panel outlets, then directs most of the remaining air to the floor outlets. A little air is also directed toward the windshield and the side window outlets. Cooler air is directed to the upper outlets and warmer air to the floor outlets. This mode directs most of the air to the floor outlets with a little air directed to the windshield and the side window outlets. 6 (Floor): 9 (Fan): Turn the left knob clockwise or counterclockwise to increase or decrease the fan speed. Turn the mode knob to OFF to turn off the fan. The mode knob can also be used to select defog or defrost mode. For more information, see "Defogging" later in this section. Operation Mode Knob: Turn the right knob clockwise or counterclockwise to direct the airflow inside of your vehicle. Temperature Knob: Turn the center knob clockwise or counterclockwise to raise or lower the temperature on the inside of your vehicle. When it's cold outside 0°F (−18°C) or lower, use the engine coolant heater, if equipped, to provide warmer air faster to your vehicle. An engine coolant heater warms the coolant that the engine uses to provide heat to warm the inside of your vehicle. For more information, see Engine Coolant Heater on page 2-19. H (Vent): This mode directs air to the instrument panel outlets, with a little air directed toward the floor vents. 3-18