1999 Chevrolet Corvette Owner's Manual - Page 167

yellowblue LOWER: This setting directs most of the air through the lower ducts to the floor area of the vehicle with some of the air also directed toward the windshield and side window vents. DEFOG: This setting divides the air between the windshield and lower outlets with a small amount directed toward the side window vents. This is useful when fog appears on the windshield or side glass due to rain or snowy conditions. DEFROST: Use this setting to quickly remove fog or frost from the windshield. This setting directs most of the airflow to the windshield with a small amount directed toward the lower and side window outlets. Mode Buttons These buttons control the air intake, the air conditioning and the rear window defogger operation. FRESH AIR: Press this button and it will bring outside air into the vehicle. The light on the button will come on when operating. Use this setting while trying to defrost or defog windows to help clear moisture. RECIRCULATE: Press this button to limit the amount of fresh air entering the vehicle by recirculating most of the air inside the vehicle. The light on the button will come on when operating. This setting is helpful when you are trying to cool the air quickly or to limit odors entering the vehicle. RECIRCULATE cannot be used while in the DEFROST or DEFOG modes. A/C: This button turns the air conditioning compressor off or on under most conditions. The light on the A/C button comes on when the compressor is operating. The air conditioning does not operate at temperatures below approximately 35_F to 40_F (2_C to 4_C). The air conditioning cools and dehumidifies the air coming into the vehicle. The air conditioning cannot be turned off in DEFROST, as it helps to remove moisture from the vehicle. It also helps to keep the windows clear. The air conditioning may be forced off at high engine speeds or high engine oil or coolant temperatures. See "Rear Window Defogger" later in this section for more information. 3-3