2003 Buick Century Owner's Manual - Page 128

Defogging and Defrosting This setting, located on the right knob, directs most of the air through the defroster and the side window outlets. Some of the air is directed to the floor and side window outlets. The air-conditioning compressor will run automaticallyin this setting unless the outside temperature is below 40°F (4°C). Rear Window Defogger @ DEF (Defrost): @ (Rear): Press the button to turn the defogger on. The rear window defogger will shut off after about 15 minutes. If you turn it on again, the rear window defogger will only run fur about seven and one half minutes before turning off. You can also turn it off by pressing the button again. To defrost the window quickly, turn the mode knob to the defrost setting and turn the driver's and passenger's temperature levers all the way to the red area. To warm passengers while keeping the windows clear, use BLEND. Notice: Don't use a razor blade or something else sharp on the inside of the rear window. If you do, you could cutor damage the defogger and the repairs would not be covered by your warranty. Do not attach a temporary vehicle license, tape, a decal or anything similarto the defogger grid. 3-19