2008 Buick Lucerne Owner's Manual - Page 164

Manual Operation * (Bi-Level): 9 (Fan): Turn the left knob either to the left or right to adjust the fan speed. Turning this control completely counterclockwise turns on the automatic fan operation. If the airflow seems low when the fan speed is at the highest setting, the passenger compartment air filter may need to be replaced. For more information, see Passenger Compartment Air Filter on page 3-30 and Scheduled Maintenance on page 6-4. This mode splits the air between the instrument panel outlets and the floor outlets. In automatic operation, cooler air is directed to the upper outlets and warmer air to the floor outlets. This mode automatically uses outside air and directs most to the floor outlets. Some air is directed toward the side window outlets and to the windshield. If recirculation is selected while in this mode, it stays on for three minutes to reduce windshield fogging. The mode control can also be used to select the floor/defog mode. Information on defogging and defrosting can be found later in this section. 7 (Floor): 9 (Off): Turn the left control to this position to turn the climate control system off. Outside air still enters the vehicle and is directed to the floor. The airflow direction and temperature can be adjusted, as indicated below. If the temperature is adjusted while the system is off, the display will light to show the current settings. Mode Control: Turn the right knob clockwise or counterclockwise to change the airflow direction. # (Air Conditioning): Press the center of the left control knob to override the automatic system and turn the air conditioning system on or off. When this button is pressed, an indicator light below the button comes on to show that this mode is activated. The air conditioning system removes moisture from the air, so a small amount of water might drip underneath the vehicle while idling or after turning off the engine. This is normal. F (Vent): This mode directs outside air to the instrument panel outlets. 3-26