2000 Chevrolet Corvette Owner's Manual - Page 177

Heating The heater works best if you keep the windows closed. Maximum heating will occur when airflow direction is in the lower mode and the temperature control knob (on a manual climate control system) is all the way in the red area. These settings will be selected by the automatic electronic dual climate control system if operating in AUTO when maximum heating is required. The BI-LEVEL setting is designed for use on sunny days when the air is only moderately warm or cool. On days like these, the sun may adequately warm your upper body, but your lower body may not be warm enough. The BI-LEVEL setting will direct cooler airflow to your upper body and warmer air to the floor area. If you have the optional engine coolant heater and use it during cold weather 0_F (-18_C) or lower, the heating system will provide heat more quickly because the coolant is already warmed. See "Engine Coolant Heater" in the Index. Defogging and Defrosting To rapidly defrost the windshield, the FRONT defrost mode (automatic electronic dual climate control system) or defrost mode (manual control system) should be used and the fan speed should be adjusted to the highest speed. With the manual control system, turn the temperature control knob all the way to the red area. To keep the windshield clear and provide heated air to the floor area of the vehicle, use the DEFOG setting. Your vehicle is equipped with side window defogger vents located near the side rearview mirrors. Rear Window Defogger REAR: This button turns the rear defogger and the heated outside mirrors on. The light on the button will come on when operating. The system automatically shuts off after approximately 15 minutes. If further defogging is desired, press the button again and it will operate for about seven and a half more minutes. The rear window defogger operates only when the engine is running. 3-11