Chevrolet 2002 Avalanche, Owner'S Manual

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The rear window defogger will only work if the ignition
is in RUN. For best results, clear the window of as much
snow or ice as possible first.
The defogger will shut itself off after several minutes.
If you need additional warming time, press the button
again. You can turn the defogger off at any time by
pressing the button.
If your vehicle is equipped with heated outside mirrors,
the rear window defogger button will also activate the
heated outside mirrors.
Do not attach a temporary vehicle license, tape or decals
across the defogger grid on the rear window.
NOTICE:
Don’t use a razor blade or something else sharp
on the inside of the rear window. If you do, you
could cut or damage the warming grid, and the
repairs wouldn’t be covered by your warranty.
Ventilation System
Your vehicle has air
outlets in the center
and on the sides of
the instrument panel.
You can move the outlets from side
-
to
-
side or up
and down to direct the flow of air. The driver’s and
passenger’s side outlets can be closed. Turn the
thumbwheel to the left to shut off air flow or to the
right to allow air flow. When you close an outlet, it will
increase the flow of air coming out of any outlets that
are open. The center outlet does not completely shut
off airflow.