2009 Chevrolet Silverado 2500 HD Extended Cab Owner's Manual - Page 217
2009 Chevrolet Silverado 2500 HD Extended Cab Manual
Page 217 highlights
# (Air Conditioning): Press to turn the air conditioning (A/C) compressor on and off. An indicator light comes on to show that the air conditioning is on. If this button is pressed when the air conditioning compressor is unavailable due to outside conditions, the indicator flashes three times and then turns off. If the air conditioning is on and the outside temperature drops below a temperature which is too cool for air conditioning to be effective, the air conditioning light turns off to show that the air conditioning mode has been canceled. On hot days, open the windows long enough to let hot inside air escape. This helps to reduce the time it takes for the vehicle to cool down. It also helps the system to operate more efficiently. The air conditioning system removes moisture from the air, so a small amount of water might drip under the vehicle while idling or after turning off the engine. This is normal. This mode recirculates and helps to quickly cool the air inside the vehicle. It can be used to help prevent outside air and odors from entering the vehicle. The recirculation mode cannot be used with floor, defog, or defrost modes. If recirculation is selected with one of those modes, the indicator light flashes three times and then turns off. The air conditioning compressor also comes 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 defog or defrost mode and increase the fan speed. The recirculation mode can be turned off by pressing the outside air button, or by turning off the ignition. ; (Outside Air): @ (Recirculation): Press to turn the recirculation mode on. An indicator light comes on to show that the recirculation is on. Press to turn the outside air mode on. An indicator light on the button comes on to show that outside is on. When selected, air from outside the vehicle circulates throughout the vehicle. The outside air mode can be used with all modes, but it cannot be used with the recirculation mode. 3-31