How to Determine if the Windshield is Leaking?

[DelMarley]

Use a spray nozzle with good atomization to continuously spray water on the windshield for 5 to 10 minutes. During this time, start the vehicle and turn on the natural warm air (ensure no one is inside). If there is no condensation inside after this period, it proves that the windshield is not leaking. Pour water on the windshield and check if there is any leakage inside the car. If there is no leakage, then pour water on the sunroof to check for any leaks.

[DiParker]

I have a personal experience to share on how to detect a leaking windshield. Once during heavy rain while driving, I suddenly noticed water droplets falling onto the steering wheel. I immediately pulled over to check and saw water stains seeping in from the corner of the windshield, which was a clear sign of leakage. I then conducted a simple test: first, I used a hose to spray water on the outside to simulate rain, then sat inside the car to observe where the water was coming in, mainly focusing on the sealing rubber around the edges of the glass. If you find any gaps or cracks, that's the problem spot. Later, I went to a repair shop and had the sealing strip replaced. They mentioned that if leaks aren't fixed promptly, it could lead to mold or rust risks inside the car. Since then, I've made it a habit to check for any dampness inside the car after every wash or rain, especially around the dashboard area. This method is simple yet practical and can help avoid major troubles.

[VanMila]

To check if the windshield is leaking, my most common methods are observation and simulation testing. After a rainy day, I open the car door and carefully inspect the interior—focusing on checking for water stains or dampness near the A-pillar and the floor mats, as water often seeps in from there. If it hasn't rained, I use a garden hose to spray water along the edges of the windshield from the outside while sitting inside the car with a flashlight to locate any points of water ingress. Checking the sealing strips is crucial: I run my fingers along them to ensure there are no cracks or detachment. Once a leak is found, I don't delay—I temporarily fix it with a sealant as a stopgap, but for a long-term solution, professional repair is necessary. Ignoring this issue can lead to short circuits in the car's electrical system or unpleasant odors, affecting both safety and health.

[DiLeah]

To check if the front windshield is leaking, I focus on simple daily observations. Right after rain or car washing, I immediately inspect interior areas like the bottom edge of the windshield or carpets under the seats. If there are wet marks or stains, it indicates leakage. Additionally, unusually fast window fogging or musty odors are also clues. For my own test, I gently pour water along the glass edges using a watering can and observe the water flow path from inside. I regularly check rubber seals for aging or cracks, addressing minor issues promptly to prevent major problems. Leaks aren't just annoying—they can cause frame corrosion, so I've developed a habit of investigating at the first sign of suspicion.