1. If the power window winding handle suddenly loosen when you are winding up or down the window glass, and the window glass unable to move further, it means the handle is broken (broken inner clip), a handle replacement is needed.
2. If the power window winding handle suddenly loosen when you are winding up or down the window glass, and the window glass dropped, it means the steel lifting cable is broken, a cable replacement is needed.
3. If you feel a sudden increase in resistance force when you are winding up or down the window glass, it might be the window regulator is faulty or there are foreign substance entering the channeling guide causing the guide to deform, need to perform a detail check the identify the problem.
4. If you hear noises or observe scratches on the car window glass when winding up or down the window, need to adjust the screw of the window bracket.
Suggest to visit workshop for repair, usually the keypoints of repair are:
1. Detail lubricating the glass channeling guide, replace the guide if necessary.
2. Check if the regulator handle is broken, if the steel lifting cable is broken, if the window regulator assembly is faulty, if the related screw is loosen. Tighten the screw or replace the part if necessary.
3. Check if the position of the steel lifting cable is correct, adjust if necessary.
4. Check and adjust the window glass bracket position.
5. Perform testing on the window to ensure the problem is resolved after repair done.