2002 Chevrolet Corvette Owner's Manual - Page 185

(Recirculate): Press this button to limit the amount of outside air entering the vehicle. The light on this air intake button will come on to show when it is operating. Recirculate is helpful when you are trying to cool the air quickly or trying to limit odors and dust from entering the vehicle. When in the AUTO mode, the system automatically selects recirculate to cool the vehicle's temperature. By pressing this button, the system will lock into the recirculated air 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. FRONT: Press the FRONT defrost button to quickly remove fog or frost from the windshield. This setting directs most of the airflow to the windshield and a small amount toward the lower and side window outlets. The light on the button will come on and the digital display will show the defrost mode symbol and fan speed when the front defrost mode is being used. Pressing FRONT defrost again will return the system to the last operating mode and the air intake mode will be in outside air. If the system is in front defrost when you shut the engine off, it will restart in FRONT defrost unless the engine is off for longer than 40 minutes. If the engine is off longer than 40 minutes, the system will restart in the operating mode you had set prior to FRONT defrost and the air intake mode will be in outside air. See "Rear Window Defogger" later in this section for more information. 3-9