Buick 2007 Terraza Owner's Manual page 196

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(Defrost): This mode directs most of the
air to the windshield and the side window outlets,
with some air directed to the floor outlets.
In this mode, the system will automatically run
the air-conditioning compressor, unless the
outside temperature is at or below freezing.
Recirculation cannot be selected while in the
defrost mode.
Do not drive the vehicle until all the windows
are clear.
Rear Window Defogger
The rear window defogger uses a warming grid
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.
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The rear window defogger will turn off about
10 minutes after the button is pressed. If turned
on again, the defogger will only run for about
five minutes before turning off. The defogger can
also be turned off by pressing the button again
or by turning off the engine.
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.