GMC 2007 Envoy - Manual (Page 194)

Rear Window Defogger
If your vehicle has the rear window defogger a
warming grid is used to remove fog from the
rear window.
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(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.
The rear window defogger will turn off
approximately 10 minutes after the button is
pressed. If you need additional warming time,
press the button again.
If your vehicle has heated mirrors, they will come
on when this button is pressed.
Notice: Do not use a razor blade or sharp
object to clear the inside rear window. Do not
adhere anything to the defogger grid lines
in the rear glass. These actions may damage
the rear defogger. Repairs would not be
covered by your warranty.
Outlet Adjustment
Use the air outlets located in the center and on the
side of the instrument panel to direct the airflow.
Operation Tips
• Keep the hood and front air inlets free of ice,
snow, or any other obstruction, such as
leaves. The heater and defroster will work
better, reducing the chance of fogging
the inside of your windows.
• When you enter a vehicle in cold weather, set
the fan speed to maximum airflow 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.
• Adding outside equipment to the front of the
vehicle, such as hood-air deflectors, may
affect the performance of the heating and air
conditioning system. Check with your
dealer before adding equipment to the outside
of your vehicle.
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