What Causes the Sand-Like Friction Sound When Rolling Up the Window?

[Elmer]

Window glass seal aging: The abnormal noise when rolling up the car window glass may be caused by aging of the window glass seal. After the seal ages, the friction increases, leading to the noise. This situation tends to be more noticeable in summer, as the aged seal expands more significantly after exposure to sunlight, resulting in greater friction and more severe noise. Dirty gap between the glass and seal: Another possible reason is that the gap between the glass and the seal is too dirty. Particles in the dust rubbing against the glass can also produce abnormal noise.