2007 Hummer H3 Owner's Manual - Page 171

# (Air Conditioning): Press the left knob on the control panel to turn the air conditioning system on or off. An indicator light on the button will be lit when the air conditioning is turned on. This system cools and dehumidifies the air entering the vehicle. The air conditioning will not function if the fan is turned off. If air conditioning is selected with fan off, the indicator will flash three times and then turn off. A slight change in engine performance may occur when the air conditioning compressor shuts off and turns on again. This is normal. The system is designed to make adjustments to help with fuel economy while still maintaining the selected temperature. The air conditioning system removes moisture from the air, so sometimes there may be a small amount of water dripping underneath the vehicle while idling or after turning off the engine. This is normal. 9 (Fan): Turn the center knob on the control panel to control the fan speed. Turn the knob clockwise or counterclockwise to increase or decrease the fan speed. 9 (Off): Turn the center knob to this position to turn the fan off. With the fan off, you may still experience airflow from the system that increases with vehicle speed depending on the mode and temperature settings. Enable recirculation mode to stop this airflow from occurring. The right knob on the control panel is used to direct the airflow inside the vehicle. Turn the knob to select one of the following modes: @(Recirculation): Press the center knob on the control panel to recirculate air inside the vehicle and prevent outside air from coming in. It can be used to prevent outside odors from entering your vehicle and cool the air inside your vehicle more quickly. Press this button to turn the recirculation mode on or off. An indicator light on the button will come on to let you know the recirculation mode is activated. 171