1997 Buick Century Owner's Manual - Page 147

BI-LEV: This setting brings in 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 ductsand a littleto the defrost and side window vents. The air conditioning compressor will run automatically in this setting unless the outside temperature isbelow 40°F (4°C). VENT This setting brings in outside air and directs it through the instrument panel outlets. Air Conditioning On very hot days, open the windows long enough to let hot, inside air escape. This reduces time for the the vehicle to cool down. For a quickcool-down on very hot days, use MAX with the temperature knob all the way in the blue area. 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 NORM with the temperature knob in the blue area. 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 and set the temperature knob to a comfortable setting. 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 differencemore at some times than others. HTR: This setting sends most of the air through the ducts near the floor. The rest comes out of the defroster and side window vents. BLEND: This setting allows half of the air to go to the floor ducts and half to the defroster and side window vents. The air conditioningcompressor will run automatically in this setting unless the outside temperture is below 40°F (4°C). 9FRONT This setting directsmost of the air through the defroster and side window vents. Some of the air also goesto the floor ducts. The air conditioning compressor will run automatically in this setting unless the outside temperatureis below 40°F (4°C). 3-3