2001 Chevrolet Impala Owner's Manual - Page 175

LOWER: This setting sends most of the air through the ducts near the floor. The remaining air comes out of the defroster and side window outlets. The RECIRCULATION button cannot be selected in this mode. DEFOG: This setting sends half of the air to the floor ducts and half to the defroster and side window outlets. The air conditioning compressor will run automatically in this setting unless the outside temperature is below 40_F (4_C). The air inlet will also be automatically set to outside air. The RECIRCULATION button cannot be selected in this mode. DEFROST: This setting directs most of the air through the defroster and side window vents. Some of the air also goes to the floor ducts. The air conditioning compressor will run automatically in this setting unless the outside temperature is below 40_F (4_C). The air inlet will also be automatically set to outside air. The RECIRCULATION button cannot be selected in this mode. OUTSIDE AIR: Press this button to force the system to use outside air. This button is usable in all of the mode settings. An indicator on the button will light up when this button is selected. RECIRCULATION: Press this button to limit the amount of outside air entering your vehicle. This is helpful when you are trying to limit odors entering your vehicle. This button is usable in UPPER and BI-LEVEL modes. An indictor on the button will light up when this button is selected. The system will default back to the outside air setting, so you will have to reselect this setting every time you restart your vehicle. While in the RECIRCULATION mode the system may cause fogging of the windows when the weather is cold and damp. To clear the fog, select either the DEFOG or DEFROST mode and increase the fan speed. To avoid refogging of the windows, use the OUTSIDE AIR setting. A/C: Press this button to turn the air conditioning on and off. The system will cool and dehumidify the air inside the vehicle when the A/C light and the fan are on. 3-5