92 240sx vert window rolls down by its self

[Manie]

I recently replaced the window amp and it rolled up and down just fine yesterday the window rolled down by its self i just thought the switch was stuck because i rolled it back up but it did it again so i unpluged the window switch and it still rolls down on its own anyone have an idea why?

[brndck]

either the window motor is garbage, or the gears that actuate the track for the window are stripped out, they will push as long as the motor is turning, but slip once it stops.

I've never seen anything like this, but its cheap/easy to find another s13 window regulator and motor