1999 Pontiac Grand Prix Owner's Manual - Page 159

yellowblue Air Conditioning On very hot days, open the windows long enough to let hot, inside air escape. This reduces the time for the vehicle to cool down. For quick cool-down on very hot days, use RECIRC. If this setting is used for long periods of time, the air in your vehicle may become too dry. For normal cooling on hot days, use UPPER with the A/C button pushed in. The system will bring in outside air and cool it. On cool, but sunny days, the sun may warm your upper body, but your lower body may not be warm enough. You can use BI-LEV with the A/C button pushed in. The system will bring in outside air and direct it to your upper body, while sending slightly warmed air to your lower body. You may notice this temperature difference more at some times than others. BI-LEV: This setting brings in the outside air and directs it two ways. Half of the air is directed through the instrument panel outlets. Most of the remaining air is directed through the floor ducts and a little to the defrost and side window vents. LOWER: This setting sends most of the air through the ducts near the floor. The remaining airflow comes out of the defroster and side window vents. DEFOG: This setting allows half of the air to go to the floor ducts and half to the defroster and side window vents. DEF: This setting directs most of the air through the defrost vent. Some of the air goes to the floor ducts and the side window vents. The air conditioning compressor will run automatically in this setting unless the outside temperature is below 38_F (3.3_C). 3-7