2000 Buick LeSabre Owner's Manual - Page 156

yellowblue Rear Window Defogger The lines you see on the rear window warm the glass. Press this button to start warming your rear and side windows. NOTICE: Do not try to clear frost or other material from the inside of the rear window with a razor blade or anything else that is sharp. This may damage the rear defogger grid. The repairs wouldn't be covered by your warranty. Ventilation System At speeds above 35 mph (55 km/h), the defogger will operate continuously until you press the REAR button again. After 10 minutes of driving below 35 mph (55 km/h), the defogger will turn off automatically. If you need additional warming time, push the button again. The system will then operate for five minutes before going off by itself. Do not attach a temporary vehicle license, tape or decals across the defogger grid on the rear window. For mild outside temperatures when little heating or cooling is needed, use VENT (on the electronic touch system or manual operation on the Dual Automatic Comfortemp system) to direct outside air through your vehicle. Air will flow through the middle instrument panel outlets. Your vehicle's flow-through ventilation system supplies outside air into the vehicle when it's moving. When the vehicle is not moving, you can get outside air to flow through by selecting any air choice (except the rear window defogger) and any fan speed. 3-9