Chevrolet Silverado Classic 2007 Owner's Manual page 231

Turn the right knob to select one of the
following modes:
-
(Defog): This mode directs the air to the
floor outlets, windshield and the side window
outlets. The air conditioning compressor will run
automatically to dehumidify the air to prevent
window fogging. The recirculation mode cannot
be selected while in the defog mode.
1
(Defrost): This mode directs most of the air
to the windshield and the side window outlets,
with only a little air directed to the floor outlets.
The air conditioning compressor will run
automatically to dehumidify the air to prevent
window fogging. The recirculation mode cannot
be selected while in defrost mode.
Do not drive the vehicle until all the windows
are clear.
Rear Window Defogger
If your vehicle has this feature, the rear window
defogger uses a warming grid to remove fog
from the rear window.
If your vehicle has a sliding rear window, you will
not have a rear window defogger.
<
(Rear): Press this button to turn the rear
window defogger on or off. An indicator light in
the button will come on to let you know that
the rear window defogger is activated. This button
will also activate the heated mirrors, if the
vehicle has them.
The rear window defogger will automatically turn
off several minutes after the button is pressed.
Pressing the button while the defogger is running
can also turn off the defogger.
W
(Mirror): If your vehicle does not have a rear
defogger and has heated mirrors, your vehicle
will have this button to activate the heated mirrors.
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 your warranty. Do not
attach a temporary vehicle license, tape, a decal
or anything similar to the defogger grid.
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