2003 GMC Yukon Owner's Manual - Page 185
2003 GMC Yukon Manual
Page 185 highlights
Rear Window Defogger If your vehicle has this feature, the lines you see on the rear window warm the glass. The rear window defogger uses a warming grid to remove fog from the rear window. Outlet Adjustment Use the air outlets located in the center and on the side of your instrument panel to direct the airflow.
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