1996 Chevrolet Corvette Owner's Manual - Page 143

"'"JNORMAL N C : Use for normal cooling on hot d e w HEATER: This setting directs most of the air g through the floor ducts and some of the air through the defroster vents. The air conditioning compressor does not run in HEATER mode. days. This setting cools outside air and directs it through the instrument panel vents. The air conditioning compressor operates in NORMAL A/C, as well as RECIRCULATE,BI-LEVEL and DEFROST. It only works when the outside temperature is above freezing. When the air conditioning compressor is on, you may sometimes notice slight changes in your vehicle's engine speed and power. This is normal because the system is designed to cycle the compressor on and off to keep the desired cooling and help fuel economy. DEFROST: This setting directs most of the air through the windshield defrosterand side window defogger vents and some of the air through the floor ducts. Heating The heater works best if you keep your windows closed while using it. Press HEATER and FAN UP, then slide the temperature control lever to a comfortable setting. If your vehicle has an engine coolant heater andyou use it in cold weather, 0°F (- 18 "C) or lower, your heating system canprovide heat more quickly because the engine coolant is already warmed. See "Engine Coolant Heater" in the Index. + BI-LEVEL: This setting cools or heats outside air , d and directs it through the instrument panel vents and the floor ducts. d o d o /I VENT: Air flows through the instrument panel vents. The air conditioning compressor does not run in VENT mode.