Can Heat Crack |verified| A Windshield Jun 2026

If your windshield has any of the following, the risk of a heat-induced crack skyrockets:

A sound like a stone hitting glass, but smaller. Higher. Almost musical. can heat crack a windshield

When you start your car, don't blast the AC immediately. Start with the windows down to let the hot air out, and gradually lower the AC temperature. If your windshield has any of the following,

Glass is a poor conductor of heat, meaning it doesn't distribute warmth evenly or quickly. Windshields are made of —two layers of glass with a vinyl (PVB) interlayer. When exposed to high temperatures, the glass undergoes thermal expansion . 1. Thermal Stress When you start your car, don't blast the AC immediately

That night, parked under a humming streetlight at a motel in Tucson, she looked up how much a new windshield cost. Three hundred dollars she didn’t really have. She sighed, cracked open another soda, and made a mental note: Never cool a hot windshield fast. Let it beg for mercy first.

If you're concerned about heat-related windshield damage, look out for these signs: