Chevrolet 2003 Silverado 1500 Pickup Owner's Manual page 183

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AJC (Air Conditioning): Press this button to
manually turn the air-conditioning system on or off.
When the system is selected, or in AUTO mode
the system will automatically begin to cool and
dehumidify the air inside of your vehicle.
If you select air conditioning off while in front defrost,
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defog mode the air conditioning off symbol will flash
to let you know this is not allowed.
You may notice a slight change in engine performance
when the air-conditioning compressor shuts off and
turns on again. This is normal.
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(Air Conditioning Off): When you turn the air
conditioning off, this symbol will appear on the display.
When the air conditioning is selected or in AUTO
mode, the system will run the air conditioning
automatically.
Defogging and Defrosting
You can use either defog or front defrost to clear fog or
frost from your windshield. Use the defog mode to
clear the windows of fog or moisture. Use the front
defrost button to defrost the front windshield.
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(Defog): Use this setting to clear the windows of fog
or
moisture. Press the mode button to select this
setting. This setting will deliver air to the floor and
windshield outlets.
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(Front Defrost): Press the front defrost button to
defrost the windshield. The system will automatically
control the fan speed if you select defrost from AUTO
mode. If the outside temperature is 40°F (4°C) or warmer,
your air conditioning compressor will automatically run to
help dehumidify the air and dry the windshield.
Rear Window Defogger
The lines you see on the rear window warm the glass.
The rear window defogger uses a warming grid to
remove fog from 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 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 you vehicle is equipped with heated mirrors this button
will activate them.
Nofice: Don't use a razor blade or something else
sharp on the inside of the rear window. If you
do, you could cut or damage the defogger 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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