Chevrolet TrailBlazer 2007 Owner's Manual page 187

Defogging and Defrosting
Fog on the inside of windows is a result of high
humidity (moisture) condensing on the cool window
glass. This can be minimized if the climate
control system is used properly. There are
two modes to choose from to clear fog or frost
from your windshield. Use the defog mode to clear
the windows of fog or moisture and warm the
passengers. Use the defrost mode to remove fog
or frost from the windshield more quickly.
Turn the right knob clockwise or counterclockwise
to select one of the following modes:
-
(Defog): This mode directs the air to the
floor outlets, windshield and side window outlets.
The recirculation button cannot be selected
while in 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 may run to dehumidify
the air to prevent window fogging. The recirculation
button 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 the rear window defogger a
warming grid is used to remove fog on the
rear window.
<
(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 active. The rear window
defogger will automatically turn off approximately
ten minutes after the button is pressed.
If your vehicle has heated mirrors, this button will
activate them.
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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