I'm also going by what someone says. If I had it in front of me I would know exactly what was wrong. In my experience , it is usually the regulator . And I know the little balls dont go , they crumble and then there is nothing to actuate the window. When they they go , you generally will not get the window up with any help from the motor. You can just pull the window up . And you will only use 10 mm nuts to fix the nylon ball until your kid gets his or her finger stuck and broken between the window and the jamb