Defogging And Defrosting; Rear Window Defogger (If Equipped) - GMC SIERRA 1997 Manual

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Ventilation Tips
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Keep the hood and front air inlet free
of
ice, snow or
any other obstruction
(such as
leaves).
The
heater
and defroster will work far better, reducing the
chance of fogging the inside of your windows.
When you enter
a
vehicle in cold weather, turn the
blower fan to
HI
for
a
few moments before driving.
This helps clear the intake ducts of snow and
moisture, and reduces the
chance
of fogging the
inside of your windows.
Keep the air path under the front seats clear of
objects. This helps air to circulate throughout
your vehicle.
The use of hood air deflectors may adversely
affect the performance of the heating and air
conditioning system.
Defogging and Defrosting
On cool, humid days, use DEFOG to keep the
windshield and side windows clear. Use DEFROST to
remove fog or ice from the windshield in extremely
humid or cold conditions. Use DEFROST with the
temperature knob toward the red area and the fan control
toward
HI.
Rear Window Defogger (If Equipped)
If you see lines running across the rear window,
you
have a rear window defogger. The lines warm the glass.
To turn on the rear window
defogger, press this button
next to the fan control knob.
The rear window defogger
will only work if the
ignition switch is turned
to 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.

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