What are the reasons for the car window not rolling down?

[VanCaden]

The car window may not roll down due to the following three reasons: 1. Insufficient lubrication in the door's internal window regulator, causing the window lift motor to enter an overheating protection state. 2. A car circuit malfunction, such as a disconnected car battery or the window control circuit being disconnected during maintenance. In this case, simply resetting the window system should resolve the issue. 3. Mechanical failure of the window, often caused by excessive dust in the window glass track, increasing resistance and hindering the window regulator from functioning properly. For this issue, it is necessary to visit a professional auto repair shop for cleaning. If the window still does not roll up or down after cleaning, it indicates that the vehicle's window regulator is damaged and requires replacement.