How Temperature Fluctuations Cause Windshield Cracks and When You Should Replace It

India experiences extreme weather shifts throughout the year. From scorching summers to cold winter nights, changes in outdoor temperatures affect your vehicle more than you might think.

One part of the car that suffers the most is the windshield. These temperature changes cause stress across the surface of the glass, often resulting in cracks that may start small but grow quickly.

At AIS Windshield Experts, we have seen how the impact of weather on windshields can turn into costly problems if ignored. Our goal is to help you understand what causes this type of damage, how to prevent it and when a complete windshield replacement is necessary.

What Is Thermal Stress?

Thermal stress occurs when the glass expands or contracts due to temperature fluctuations. For example, when your car is parked in the sun, and you turn on the air conditioner at full blast, the sudden shift from hot to cold can put intense pressure on the glass.

Another common cause of cracks in windshields is when a frozen windshield is suddenly exposed to heat from the defroster or hot water. This sudden temperature change creates uneven pressure across the glass layers and forms invisible microfractures that eventually spread.

Common Crack Patterns Due to Temperature

• Stress Cracks: These often appear near the edge and can grow inward without warning.
• Long Straight Cracks: These usually form horizontally or vertically and can stretch across the glass with a single temperature shift.
• Spider-line Cracks: When thermal damage begins near a chip, fine lines may spread outward in multiple directions.

If you see any of these signs on your car windshield in winter or summer, do not wait to get it checked, as these cracks can spread very quickly.

When Can It Be Repaired vs Replaced?

The cracks can be repaired if they appear as a standalone small crack towards the centre of the windshield. However, windshield replacement becomes necessary in the following cases:

• If the crack is longer than six inches.
• If the crack touches the edge of the windshield.
• If multiple stress cracks are visible in the same area.
• If the chip or crack lies directly in front of the driver’s view.

Our experts will assess the damage first before recommending a solution. Whether it is repair or replacement, our team ensures the job is done with proper safety and quality materials.

How To Prevent Thermal Damage to Your Windshield

• Cool the Cabin Gradually: Do not blast cold air directly on a hot windshield. Lower the temperature in steps to reduce thermal shock.
• Park Under Shade: If parking your car during daylight hours, try to find a covered spot, such as a garage, under a tree or in a dedicated parking lot to avoid sudden temperature fluctuations.
• Use a Windshield Cover: During winter or extreme summer, a cover helps reduce the temperature gap between the glass and the air.

Conclusion

A crack caused by temperature stress may start small. However, if left alone, it often leads to severe glass failures. The stress from seasonal changes, along with daily temperature swings, can compromise the safety and durability of your windshield.

When cracks do not appear, it is likely due to thermal stress. If you notice any cracks but are unsure of the right solution, call AIS Windshield Experts, and we will get it sorted. Our team of experts will come to your location, assess the damage and condition and then suggest the most viable solution.

Call us today, and let our experts take care of your car, no matter the weather conditions or crack intensity.