2006 Buick Lucerne Owner's Manual - Page 151

After your vehicle is started, the display will show the interior temperature settings. When the ENG/MET (English/metric) button on the Driver Information Center (DIC) is pressed, the display will show readings in Fahrenheit or Celsius. Use the ENG/MET button to toggle between them. AUTO #(Automatic Air Conditioning): If the AUTO position is selected on the fan or mode control, the system will automatically control the air conditioning compressor. The A/C compressor will run automatically even at cool outside temperatures in order to dehumidify the air. The A/C indicator light will be lit when the system is operating automatically, even at near freezing outside temperatures. Press the A/C button on the fan control to turn off the A/C. For improved window clearing performance in defog or defrost modes, the A/C compressor will run automatically in damp cool conditions. If the AUTO position is selected on either the fan or mode control, the system will automatically control the air inlet to supply fresh outside air or recirculate the interior air to cool the car faster. The indicator light on the recirculation button will light whenever the system switches to recirculation. You may force outside air by pressing the button when the light is lit. The next time AUTO fan or mode is selected, the air inlet will reset back to AUTO operation. Manual Operation 9(Fan): Turn the left knob either to the left or right to adjust the fan speed. Turning this control completely counterclockwise will turn 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 3-31 and Scheduled Maintenance on page 6-4. 9(Off): Turn the left control to this position to turn the entire climate control system off. To change the current mode, select one of the following positions using the right control: F(Vent): Turn the control to this mode to direct air to the instrument panel outlets. h (Auto Recirculation): *(Bi-Level): Turn the control to this mode to direct approximately half of the air to the instrument panel outlets and most of the remaining air to the floor outlets. In automatic operation, cooler air is directed to the upper outlets and warmer air to the floor outlets. 3-27