2005 GMC Savana Van Owner's Manual - Page 134

Rear Window Defogger Some vehicles may have a rear window defogger. Outlet Adjustment Use the outlets located near the center and on the sides of the instrument panel to change the direction of airflow. < R. DEF (Rear Defrost): Press this button to turn the rear window defogger on or off. Be sure to clear as much snow from the window as possible. The rear window defogger uses a warming grid to remove fog or frost from the rear window and will only work when the ignition is RUN. The rear window defogger will turn off several minutes after the button is pressed. If turned on again, the defogger will run for several more minutes before turning off. The defogger can also be turned off by pressing the button again or by turning off the engine. Notice: Using a razor blade or sharp object to clear the inside rear window may damage the rear window defogger. Repairs would not be covered by your warranty. Do not clear the inside of the rear window with sharp objects. Operation Tips • Clear away any ice, snow or leaves from the air inlets at the base of the windshield that may block the flow of air into your vehicle. • Use of non-GM approved hood deflectors may adversely affect the performance of the system. • Keep the path under the front seats clear of objects to help circulate the air inside of your vehicle more effectively. 3-20