1998 Buick Century Owner's Manual - Page 144

Comfort Controls Manual Single Zone Climate Control Temperature Knob The centerknob changes the temperature of the air coming through the system. Turn this knob toward red (to the right) for warmer air. Turn it toward blue (to the left) for coolerair. Mode Knob W 0 - W W The right knob has several settings to control the direction of airflow: () ~- COMFORT CONTROL With this system, you can control the heating, cooling and ventilation in your vehicle. The system works best if you keep your windows closed while using it. MAX: This setting recirculates much of the air inside your vehicle and sends itthrough the instrument panel outlets. The air conditioning compressor will run automatically in this setting unless the outside temperature is below 40°F (4°C). (Even when the compressor is running, you can control the temperature.) Fan Knob The left knob selects the amount of air you want. To turn the fan off, turn the knob to OFF. NORM: This setting brings in outside airand sends it through the instrument panel outlets. The air conditioning compressor will run automatically in this setting unless the outside temperature is below 40°F (4°C).(Even when the compressor is running, you can control the temperature.) If the airflow seems very low when the fan knob is turned to the highest setting, regardless of the mode setting, your passenger compartment a r filter may need to be replaced. i See "Maintenance Schedule'' in the Index.