cold weather windshield damage

Direct Answer: Using the front windshield defroster on a cracked windshield is riskier than using the rear defroster, because front defrost blasts hot air directly onto damaged glass, accelerating crack propagation. In contrast, the rear defroster heats a separate glass panel and poses no direct risk to a cracked front windshield. The safest option in cold weather is low-heat, gradual defrosting combined