2009 Chevrolet Suburban Owner's Manual - Page 212

Rear Window Defogger The rear window defogger uses a warming grid to remove fog from the rear window. Press this button to turn the rear window defogger on or off. The system automatically turns off several minutes after it has been activated. The defogger can also be turned off by turning off the engine. Do not drive the vehicle until all the windows are clear. For vehicles with heated outside rearview mirrors, the mirrors will heat to help clear fog or frost from the surface of the mirror when the rear window defog button is pressed. Notice: Do not use anything sharp on the inside of the rear window. If you do, you could cut or damage the warming grid, and the repairs would not be covered by the vehicle warranty. Do not attach a temporary vehicle license, tape, a decal or anything similar to the defogger grid. Dual Automatic Climate Control System The heating, cooling, and ventilation in the vehicle can be controlled with this system. The vehicle also has a flow-through ventilation system described later in this section. If this vehicle is a Two-mode Hybrid, see the Two-mode Hybrid manual for more information. < (Rear Window Defogger): 3-24