1995 GMC Safari Owner's Manual - Page 121

Rear Wjndow Defogger (Option) If your vehicle has this option, the rear window will have lines running across the glass. These lines heat your window. For best results, clear the window of as much snow or ice as possible before using the rear window defogger. ' To turn on the rear window defogger, find the switch marked REAR DEFOG on your instrument panel to the left of the steering column. Press the top of this switch until the light in the switch comes on, then release it. The rear window defogger will only work when the ignition switch is in the RUN position. You can turn the defogger off at anytime by pressing the bottom of the switch. The defogger will shut itself off afterseveral minutes so that the glass does not get too hot. If the window still isn't clear, turn the defogger on again. NOTICE: Scraping the inside of your rear window could cut and damage the defogger. Your warranty would not cover this damage. And don't put decals there, you might have to scrape them off. 3-5