Chevrolet 2004 Corvette Owner's Manual page 141

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(Recirculation): This mode keeps outside air
from coming in the vehicle. It can be used to prevent
outside air and odors from entering your vehicle or
to help cool the air inside your vehicle more quickly.
Press this button to turn the recirculation mode on or off.
When the button is pressed, an indicator light will
come on. The air-conditioning compressor also comes
on. The recirculation mode cannot be used with the
outside air mode.
When in the AUTO mode, the system automatically
selects recirculation to cool the vehicle's temperature.
By pressing this button, the system will lock into
recirculation mode. Any adjustment to the air intake
must then be made manually. Recirculation is not
available when using the defrost or defog mode because
outside air is needed to reduce moisture inside of the
vehicle.
Operating the system in the recirculation mode may
cause fogging of the vehicle's windows when the
weather is cold and damp. To clear the fog, switch the
system to either the defog or defrost mode and
increase the fan speed. To avoid re-fogging of the
windows, operate the system in the outside air mode.
Temperature Control: The DRIVER knob changes the
temperature on the driver's and passenger's side of
the vehicle. Turn the knob clockwise or counterclockwise
to manually increase or decrease the temperature
inside your vehicle. Whenever you turn this knob, the
temperature will be displayed for about five seconds
along with the current fan speed and air delivery mode.
The PASSENGER knob changes the temperature on
the passenger's side of the vehicle. When the knob is in
the 12 o'clock position, the passenger's temperature
is the same as the driver's. Turn the knob clockwise for
warmer air on the passenger's side or counterclockwise
for cooler air. If the driver-set temperature is set at
full cold 60°F (16°C) or full hot 90°F (32°C), turning the
PASSENGER knob has no effect because the system
is locked at a maximum setting.
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