Chevrolet 2008 Optra Owner's Manual page 133

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(Defog): This mode directs most of the air to the
windshield and the floor outlets. A small amount of air
is also directed to the outboard outlets for the side
windows and to the instrument panel side outlets.
When this mode is selected, the system runs the
air-conditioning compressor. To defog the windows
faster, turn the temperature control knob clockwise to
the warmest setting.
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(Defrost): This mode directs most of the air to the
windshield and the outboard outlets for the side
windows. A small amount of air is also directed to the
instrument panel side outlets.
When this mode is selected, the system runs the
air-conditioning compressor. To defrost the windows
faster, turn the temperature control knob clockwise
to the warmest setting.
Front Heated Windshield
Your vehicle may have a heated front windshield which
can be used with defog and defrost. This feature will
only work when the ignition is turned to ON/RUN.
The front heated windshield uses a heated element to
remove fog or frost from the bottom of the windshield.
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(Rear): Press this button located below the
audio system. An indicator light in the button comes
on to show that the feature is activated. The front
windshield heater will turn off about ten minutes after
the button is pressed. To manually turn off the heater,
press the button again or turn off the engine. See "Rear
Window and Outside Mirror Defogger" later in this
section for more information on this button.
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