Chevrolet 2003 Venture Owner's Manual page 210

Defogging and Defrosting
There are two modes 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 to select the defog or defrost mode.
(Defog): This mode directs air to the windshield
and the floor outlets. When you select this mode,
the system turns off recirculation and runs the
air-conditioning compressor unless the outside
temperature is at or below freezing. The recirculation
mode cannot be selected while in the defog mode.
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(Defrost): Pressing this button 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 turn off recirculation
and run the air-conditioning compressor, unless the
Recirculation cannot be selected while in the
defrost mode.
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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.
The rear window defogger will turn off approximately
10 minutes after the button is pressed. If turned on
again, the defogger will only run for approximately five
minutes before turning off. The defogger can also
be turned off by pressing the button again or by turning
off the engine.
Nofice: Don't use anything 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. Do not attach a temporary
vehicle license, tape, a decal or anything similar
to the defogger grid.
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