2004 Chevrolet Corvette Owner's Manual - Page 140

9(Fan): Press the button with the fan symbol to manually increase or decrease the fan speed. Keep pressing the up or down arrow on this switch until the desired fan speed appears on the display. Pressing the arrows will delete AUTO from the digital display. The fan graphics with the fan speed bars will be shown. To increase the fan speed so that more air flows into the vehicle, press the up arrow on the fan switch. To decrease the fan speed and airflow, press the down arrow. The AUTO button must be pressed to return to the automatic fan control. : (Outside Air): Press this button to turn the outside air mode on or off. When this mode is on, outside air will circulate throughout your vehicle. When the button is pressed, an indicator light in the button will come on to let you know that it is activated. The outside air mode can be used with all modes, but cannot be used with the recirculation mode. When in the AUTO mode, the system automatically selects outside air instead of recirculation, as required, to control the temperature in the vehicle. By pressing outside air, the system will lock into the outside air mode. Any adjustment to the air intake must then be made manually. Outside air should be used when trying to defrost or defog windows to help reduce moisture inside of the vehicle. If you are in city traffic, your vehicle is stopped and idling, or the weather is hot, the system may switch from the outside air mode to the recirculation mode. To prevent the air inside of your vehicle from becoming stale, be sure to return to the outside air mode periodically. 3-26