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The little red, almost rust colored, lines in the rear window of many cars is the Rear Window Defogger. Sometimes, this is also referred to as a "Defroster". When the Rear Window Defogger is activated, a small amount of electricity is applied to those red lines, which causes them to increase in heat temperature. In turn, this will help to warm up the glass surrounding the wires, which in turn helps to de-ice or de-fog the window.

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One of three things usually fails on a rear defroster. The switch can fail (it should have a light within the switch which should be illuminated when turned on). The tabs can break off the rear glass. Or the lines have "worn" off the glass. Both of these should be able to be repaired by a glass company for a small expense.


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