The thin lines on your car’s rear window are an electrical heating grid designed to clear frost, ice, and condensation.When the rear defroster is activated, electricity heats these conductive strips, improving visibility without relying on hot air.The system usually turns off automatically, but the delicate lines can be damaged by scrapers, abrasive materials, or sharp objects.If a strip breaks, that section may stop heating, but conductive repair kits can often fix it—so clean the glass gently and avoid scraping across the lines…
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