Why does the new car's window glass make a screeching noise when rolling up and down on rainy days?

[VanAddyson]

The reasons for abnormal noise during the window glass rolling up and down include foreign objects in the rubber guide rail, etc. Below are the specific reasons for the abnormal noise during window glass rolling up and down: 1. Dirty rubber guide rail of the door glass: The rubber guide rail of the door glass tends to accumulate dust, causing abnormal noise when the glass rolls up and down. In this case, you can first clean the dust in the rubber guide rail with water, dry the moisture, and then spray a little rubber protectant or lubricant on the rubber guide rail. The noise during glass rolling will then disappear. 2. Aging rubber guide rail of the door glass: The rubber guide rail of the door glass is exposed to sun and rain all year round, making it prone to aging and losing elasticity. When the glass rolls up and down, friction with the aged rubber guide rail will produce abnormal noise. This situation can only be resolved by replacing the rubber guide rail with a new one.

[DeArya]

Having run an auto repair shop for years, I often encounter new cars whose windows emit screeching friction noises during rainy days. The primary cause is that new car components haven't fully broken in yet—for instance, the window guide rails or sealing strips are made of stiff materials that feel dry and rough. When rainwater seeps in, it significantly increases friction. Additionally, new cars often leave the factory with insufficient lubrication, and rainwater adhesion creates resistance, causing the rubber strips and glass to collide noisily during operation. You can first try a DIY solution: apply some automotive-grade silicone-based lubricant to the inner side of the window tracks and seals (perform this after the rain stops for instant relief). If the issue persists, it might indicate deformed guide channels or misaligned installation, requiring a 4S店 inspection and adjustment. This problem is quite common in new vehicles—don't overreact but don't ignore it either, as repeated operation could wear down components. Always ensure windows are fully closed when parked to minimize debris entry and protect the window regulator system. Regular maintenance extends lifespan and ensures smooth window operation.

[VonAva]

Right after I got my new car, the windows would squeak annoyingly when rolled up or down on rainy days. I guessed it was because the rubber seals were new and stiff, becoming even rougher when soaked by rainwater, increasing friction and causing that sharp noise. I tried fixing it myself: wiped the window frame gaps clean of dust and mud with a damp cloth, then ordered a window lubricant spray online and gave it a light spritz. The next day, the problem was much better. This is common during the break-in period of new cars and usually improves after a few weeks of driving. But if the noise persists after the rain stops, it might be an installation issue or debris in the tracks. It’s good to check with the manufacturer for advice. Remember, don’t force the switch to avoid damaging the motor. During regular car washes, pay attention to cleaning the window frames to prevent small stones from getting stuck. Don’t panic over minor issues with a new car—most can be solved simply. For safety, always ensure the windows operate normally before hitting the road.

[AutumnRose]

New car window squeaking in rainy conditions is often caused by dry or rough seals/guides increasing friction when wet. Insufficient factory lubrication and unbedded parts can make rubber strips scrape glass harshly during operation. Check guide rail cleanliness, remove accumulated water; applying dedicated window lubricant to tracks usually resolves it. Persistent noise may indicate motor or rail design issues – visit a specialist shop to inspect installation precision if needed. Regular maintenance extends system lifespan and ensures smooth operation. While not a major fault, timely attention prevents escalation.