A windshield in the Phoenix metro goes through more in one July afternoon than many windshields see in a month elsewhere. The glass bakes in a parking lot, then you start the car and hit it with maximum air conditioning. That rapid swing matters more than most drivers realize.
Thermal Stress, Explained Simply
Glass expands as it heats and shrinks as it cools. A healthy windshield flexes through those cycles without complaint. A chipped one doesn't: the damage is a weak point, and every expand-and-contract cycle pries at it. What starts as a dot the size of a pea can run into a crack across the driver's view — often overnight, often after a single AC blast.The Habits That Buy You Time
None of these fix the chip, but they slow the clock while you arrange a repair:- Park in shade or a garage when you can. Less heat soak means less expansion.
- Cool the cabin gradually. Start the AC low instead of full arctic on a baked windshield.
- Skip the pressure washer. High-pressure water against a chip is asking for a spread.
- Avoid slamming doors. The pressure pulse inside the cabin flexes the glass.