2007 Buick Lucerne Owner's Manual - Page 184

# (Air Conditioning): Press this button to turn the air conditioning system on or off. When this button is pressed, an indicator light below the button will come on to let you know the air conditioning is activated. Air conditioning can be selected in any mode as long as the fan knob is not in the off position. On hot days during the vehicle's initial start-up, open the windows to let hot inside air escape; then close them. This helps to reduce the time it takes for the vehicle to cool down. It also helps the system to operate more efficiently. For quicker cool down on hot days, do the following: 1. Select the vent air mode. 2. Select the recirculation mode. 3. Select the air conditioner. 4. Select the coolest temperature. 5. Select the highest fan speed. The air-conditioning system removes moisture from the air, so you may sometimes notice a small amount of water dripping underneath your vehicle while idling or after turning off the engine. This is normal. 184 Defogging and Defrosting Fog on the inside of the vehicle is a result of high humidity causing moisture to condense on the cool window glass. This can be minimized if the climate control system is used properly. There are two modes to clear frost or fog from the windshield. Use the floor/defog mode to clear the windows of condensation and to warm the vehicle's occupants. Use the defrost mode to remove frost or condensation from the windshield quickly. See "Rear Window Defogger" later in this section for information on clearing the rear window of fog or ice. Turn the right knob to select the defog or defrost mode. The recirculation mode cannot be selected while in these modes. - (Floor/Defog): This mode directs half of the air to the windshield and the side window outlets and half to the floor outlets. The system runs the air conditioning compressor unless the outside temperature is near or below freezing. 0 (Defrost): This mode directs most of the air to the windshield and the side window outlets. The system runs the air conditioning compressor unless the outside temperature is near or below freezing.