Those thin horizontal lines running across a car’s rear windshield are not decoration. They form the rear-window defroster, an electrical heating grid designed to clear fog, frost, and light ice from the glass.
On a cold or humid morning, this small system can make the difference between backing up safely and trying to see through an opaque window. Because the grid looks simple, many drivers overlook how carefully it is built and how easily it can be damaged.
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