Rear Window Defogger - GMC 2010 Sierra Owner's Manual

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(Recirculation): Press to turn the recirculation
mode on. 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, defog
or defrost modes. If recirculation is selected with one of
these modes, the indicator light flashes three times and
then turns off. 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.
# (Air Conditioning): Press 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.
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.
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Rear Window Defogger

For vehicles with a rear window defogger, a warming
grid is used to remove fog from the rear window.
< (Rear): Press to turn the rear window defogger on or
off. An indicator light on the button comes on to show
that the rear window defogger is on.
The rear window defogger only works when the ignition
is in ON/RUN. The rear window defogger stays on for
approximately 10 minutes after the button is pressed,
unless the ignition is turned to ACC/ACCESSORY or
LOCK/OFF. The defogger can also be turned off by
turning off the engine.
Notice: Do not use anything sharp on the inside of
the rear window. If you do, you could cut or damage
the warming grid, and the repairs would not be
covered by the vehicle warranty. Do not attach a
temporary vehicle license, tape, a decal or anything
similar to the defogger grid.