Chevrolet 2010 Corvette Owner's Manual page 186

Recirculation cannot be selected while in the defrost
1
mode. Pressing again will return the system to the
last operating mode.
For severe ice conditions, turn the driver's temperature
knob to 32°C (90°F) while in defrost mode.
Do not drive the vehicle until all the windows are clear.
^
(Air Conditioning Off): Press to turn the air
conditioning compressor off. Press AUTO to return to
automatic operation. When in AUTO, the air conditioning
compressor comes on automatically, as needed.
Air conditioning does not operate at temperatures below
about 2°C to 4°C (35°F to 40°F). In temperatures
above 4°C (40°F), the air conditioning cannot be turned
off in defrost and defog, as it helps to remove moisture
from the vehicle. It also helps to keep the windows clear.
You may notice a slight change in engine performance
when the air-conditioning compressor shuts off and
turns on again. This is normal. The system is designed
to make adjustments to help with fuel economy while
still maintaining the selected temperature.
On hot days, open the windows to let hot inside air
escape; then close them. This helps to reduce the time
it takes for the vehicle to cool down. It also helps the
system to operate more efficiently.
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For quick cool down on hot days press the AUTO button
and adjust the temperature to a cool, comfortable setting.
To achieve maximum cool down, do the following:
H
1. Select mode.
?
2. Press .
3. Select the a/c on.
4. Select the coolest temperature.
5. Select the highest fan speed.
Using these settings together for long periods of time
may cause the air inside of your vehicle to become too
dry. To prevent this from happening, after the air in the
vehicle has cooled, turn the recirculation mode off.
The air conditioning system removes moisture from the
air, so a small amount of water might drip under the
vehicle while idling or after turning off the engine. This is
normal.
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(Recirculation): Press to turn the recirculation
mode on or off. An indicator light comes on to show that
recirculation is on. This mode prevents outside air from
entering your vehicle. It can be used to prevent outside
air and odors from entering your vehicle and to help cool
the air inside your vehicle more quickly. Recirculation
mode is not available in defrost or defog mode.