2004 Chevrolet Silverado 1500 Pickup Owner's Manual - Page 182

Dual Climate Control System With this system you can control the heating, cooling and ventilation for your vehicle. To change the current mode, select one of the following: H (Vent): panel vents. This mode directs air to the instrument )(Bi-Level): This mode directs half of the air to the instrument panel vents; then directs most of the remaining air to the floor vents. A little air is directed toward the windshield and the side window vents. Cooler air is directed to the upper vents and warmer air to the floor vents. 6 (Floor): This mode directs most of the air to the floor vents with a little air directed to the windshield and the side window vents. 9(Fan): Turn the left knob clockwise or counterclockwise to increase or decrease the fan speed. Turn the knob to the off position to turn off the fan. If the knob is in off outside air will still enter the vehicle, and will be directed based on the position of the mode knob. The temperature can also be adjusted using the temperature levers. Turn the right knob clockwise or counterclockwise to direct the airflow inside of your vehicle. h (Recirculation): The recirculation mode is used to recirculate the air inside of your vehicle. Use this mode to help prevent outside odors and/or dust from entering your vehicle or to help cool the air inside of your vehicle more quickly. Press this button to turn the recirculation mode on or off. The light on the recirculation button will illuminate. Recirculation cannot be used in floor, blend or defrost modes. An indicator on the button will light up, flash three times and turn off when recirculation is selected in these modes.The air-conditioning compressor will also come on when this mode is activated. While in recirculation mode the windows may fog when the weather is cold and damp. To clear the fog, select either the blend or defrost mode and increase fan speed. 3-22