Discover why cold weather worsens windshield cracks and get practical tips to protect your auto glass during winter months.
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Cold weather and existing windshield cracks are a dangerous combination. Here is why — and what you can do about it.
Yes, cold weather is bad for a cracked windshield. Low temperatures cause glass to contract, and when combined with an existing crack, the stress can cause it to spread rapidly — sometimes overnight.
As temperatures drop, glass contracts. This contraction puts stress on any existing damage — chips or cracks — and can cause them to grow quickly.
Moisture that has entered a crack can freeze and expand, forcing the crack wider. This is one of the most common causes of small chips turning into full-length cracks overnight in winter.
Blasting hot air from your defroster onto a frozen windshield causes rapid thermal expansion on one side of the glass. If there is an existing crack, this sudden change can extend it dramatically.
Running wiper blades over ice and snow puts mechanical stress on the glass. If blades are frozen to the surface, forcing them can further damage an already cracked windshield.
Parking in a garage or shaded location protects your windshield from freezing temperatures. If already cracked, a stable environment helps reduce the chance of needing full windshield replacement during the season.
Start your vehicle and let the engine warm up gradually. Use your climate control system on low heat first, increasing slowly, rather than blasting hot air at a cold windshield.
A temporary seal using clear tape or a windshield repair kit prevents debris from worsening the damage. This short-term fix helps maintain the glass until a professional auto glass replacement or repair can be done.
Do not wait until spring. Cold weather accelerates crack growth. Book a professional repair or replacement as soon as possible to prevent the damage from becoming much worse.
Pouring hot water on a frozen windshield is one of the fastest ways to cause a crack to spread. Use an ice scraper and let the defroster do its work.
Remove all snow from your windshield before driving. Wet snow is heavy and wiper blades dragging it across a crack can extend it.
In winter conditions, inspect your windshield more frequently. Catching new chips early when they are small makes repair easy and affordable.
Old wiper blades are stiffer in cold weather and can scratch or stress the glass. Switch to winter blades before the cold season arrives.
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