Will chip in windshield spread? 'Minor cracks and chips in your windshield will spread when exposed to intense heat and sunlight . Be proactive and get your auto glass repaired as soon as you see damage. '” If you drive on bumpy roads or slam your car doors it may actually cause your windshield crack to expand! What makes a windshield crack worse? Can your windshield crack from cold? It's possible. Cold temperatures cause contraction—even in glass—and if it's cracked or chipped the added pressure can cause further damage. The sun can also make the crack or chip worse, as it can increase the temperature of the windshield, causing the crack or chip to expand. Can a windshield crack from defroster? Perfect Touch Auto Glass tech, SwabiDabi, says that using your defroster to melt ice can actually end up cracking your windshield . ... When you use your defroster to melt ice, the rapid temperature change from cold to hot can expand a crack. Its important to repair you...