Windshields are essential for visibility and safety in any vehicle, but glass can be sensitive to temperature changes. Varying temperatures, whether hot or cold, can lead to degradation, damage, decreased visibility, and even total windshield failure if left unchecked. Here’s how both extremes of hot and cold affect your windshield and what you can do to protect it.

Hot Temperatures and Windshield Damage

In hot weather, windshields expand due to the intense heat. If a windshield is already chipped or cracked, the heat can exacerbate these minor flaws, turning small cracks into larger, more serious, ones.

High temperatures also cause the windshield’s edges, which are structurally more vulnerable, to warp more than the central part, leading to increased stress on the glass. This warping effect is intensified if your vehicle is exposed to direct sunlight for extended periods.

To protect your windshield from extreme heat, park in shaded areas or use a sunshade. Regularly inspecting the windshield for small cracks and getting them repaired can prevent these cracks from spreading under temperature pressure.

Cold Temperatures and Windshield Damage

It’s simple physics. While glass expands at high temperatures, conversely, glass will contract in low temperatures. This too can lead to increased pressure if the windshield is damaged or stressed in any way.

When you turn on the car’s defroster on a frigid morning, the warm air can cause rapid expansion. This temperature contrast stresses the glass, especially if there are pre-existing chips, making cracks more likely. Ice removal can also damage the glass. Scrapers can create tiny nicks, and you must never melt ice with hot water which can lead to temperature shock, cracking or even shattering the windshield.

To keep your windshield safe during winter, avoid sudden temperature changes. Use a de-icer spray instead of hot water and scrape gently if needed. Covering your windshield overnight can also reduce ice buildup, minimizing the need for scraping.

Whether it’s summer heat or winter chill, sudden or extreme temperature changes can lead to windshield damage. By taking preventive measures, regularly inspecting for small cracks, and addressing any damage early, you can keep your windshield intact, ensuring a safer driving experience year-round.