Chevrolet 2009 Suburban Owner's Manual page 211

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(Defog): The defog mode is used to clear the
windows of fog or moisture. Air is directed to the
windshield, floor outlets, and side window vents. In this
mode, the system turns off recirculation and runs
the air conditioning compressor unless the outside
temperature is close to freezing. The recirculation mode
cannot be selected while in the defog mode.
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(Defrost): The defrost mode is used to remove fog
or frost from the windshield more quickly. Air is directed to
the windshield and side window vents, with some directed
to the floor vents. In this mode, the system automatically
forces outside air into the vehicle. The recirculation mode
cannot be selected while in the defrost mode. The air
conditioning compressor runs automatically in this
setting, unless the outside temperature is close to
freezing.
Do not drive the vehicle until all the windows are clear.
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(Air Conditioning): Press this button to turn the air
conditioning system on or off. An indicator light comes
on to show that the air conditioning is on. The air
conditioning can be selected in any mode as long as
the fan switch is on.
On hot days, open the windows to let hot inside air
escape; then close them. 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.
h
(Recirculation): Press this button to turn the
recirculation mode on or off. An indicator light comes on
to show that recirculation is on.
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, defrost,
or defogging modes. If recirculation is selected while in
one of those modes, the indicator flashes three times and
turns off. 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 defog or defrost
mode and increase the fan speed. The recirculation mode
can also be turned off by turning off the engine.
REAR: Press to turn the rear heating and air
conditioning on. See Rear Air Conditioning and Heating
System on page 3-31 or Rear Air Conditioning and
Heating System and Electronic Climate Controls
on page 3-32 for more information.
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