South Texas is known for having an extremely hot climate, especially during the summer months. Places like McAllen, Laredo, Corpus Christi, and Brownsville frequently see temperatures above 100 degrees Fahrenheit. This extreme heat can take a major toll on vehicles parked outside for extended periods of time, especially on windshields. Here's an in-depth look at how South Texas summer heat impacts car windshields.
Expanding and Contracting Glass
One of the biggest issues caused by intense South Texas heat on windshields is expansion and contraction of the glass. As temperatures rise to very hot levels during the day, the glass heats up and subtly expands. Then as overnight temperatures cool back down significantly, the heated glass rapidly contracts. This constant expansion and contracting puts extra stress on the windshield over time.
It can cause small cracks and chips in the glass to spread quicker than they normally would. The cracks tend to spread most rapidly if there is a big difference between daytime peak heat and nighttime cooling. Places like Laredo can have a 60-70 degree difference between daily highs and lows in the summer, leading to major expansion and contraction of windshield glass daily.
Seal Weakening
The extreme heat in South Texas during summer months can also weaken or damage the seals that hold the windshield in place. Windshields are carefully sealed to the vehicle's body for safety, stability, and to prevent leaks. However, the heat causes the various seal materials to gradually lose integrity and soften up.
This makes it more likely for wind and pressure changes while driving to introduce gaps in the sealing over time. It also increases the chance of leaks anytime it rains. If leaks do occur around the windshield seals, it can promote glass corrosion and increase stress points.
Increased Sun Damage
Being parked under the blazing South Texas sun for hours at a time can also cause more sun damage to windshield glass. The sun's UV rays bore down on the glass, creating internal heat build-up. This constant bombardment by the sun's rays degrades the chemical bonds within the glass through a process known as solarization. It causes the glass to take on a purple or clouded tint over an extended period of time.
Besides being an eyesore, it also continues to weaken the glass structurally. Solarization usually builds up the most on the parts of the windshield receiving the most direct sunlight. So, for cars parked facing south, the top portion of glass would tend to show the most advanced solarization over time.
Cracked Rubber Seals
Extreme heat exposure can also wreak havoc on the rubber molding seals around the edge of the windshield. As temperatures soar over 100 degrees for days at a time, the rubber dries out. This causes it to contract and crack or split open. Cracked rubber seals not only look bad, but they allow for gaps where air, noise, and moisture can penetrate into the cabin.
It also introduces new weak points for the windshield glass by compromising its stable sealing surface. Cracked rubber seals tend to let even more hot air flow onto the edge of the glass. So, it turns into a repetitive cycle of seal damage and additional glass expansion as soon as the brutal South Texas summer heat kicks in.
Final Words
The intense summer heat that South Texas experiences subjects parked vehicles and their windshields to all kinds of durability threats. From seal weakening to glass solarization, it's a recipe for accelerated windshield wear and tear. Vehicle owners in this region must be vigilant about parking in shaded areas whenever possible and having cracked glass proactively repaired. But in case your windshield gets damaged by the heat, you shouldn't take a risk by driving around. Instead, feel free to contact us at A-1 Auto Glass. We are the leading auto windshield repair and replacement company in McAllen.