Chevrolet 2007 Avalanche Owner's Manual page 229

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(Air Conditioning): Press this button on
the left knob to turn the air conditioning system
on or off. When A/C is pressed, an indicator
light will come on to let you know that the
air conditioning has been activated.
On hot days, open the windows to let hot inside
air escape; then close them. This helps to reduce
the time it takes for your vehicle to cool down.
It also helps the system to operate more efficiently.
The air conditioning system removes moisture
from the air, so you may sometimes notice a
small amount of water dripping underneath
your vehicle while idling or after turning off the
engine. This is normal.
Defogging and Defrosting
Fog on the inside of the windows is a result of
high humidity (moisture) condensing on the
cool window glass. This can be minimized if
the climate control system is used properly.
There are two modes to clear fog or frost from
your windshield. Turn the right knob clockwise
to select the defog or defrost mode.
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(Defog): The defog mode is used to clear
the windows of fog or moisture and warm
the passengers. This mode directs air to the
windshield, floor outlets, and side window vents.
When you select 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. Do not
drive the vehicle until all the windows are clear.
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(Defrost): The defrost mode is used to
remove fog or frost from the windshield more
quickly. This mode directs a portion of the air
to the windshield and side window vents and
some to the floor vents. In this mode, the system
will automatically force outside air into your
vehicle. The recirculation mode cannot be selected
while in the defrost mode. The air conditioning
compressor will run 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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