I've removed and installed power window motors and regulators, but I'm not
sure what's causing the current problem.  I started to drive earlier
today, powered the window down about two inches, and all of a sudden, the
window glass dropped all the way the bottom.   Pressing the switch would
not bring the window back up, though the motor still makes noise.  After
removing the door panel, I was able to lift the glass manually (it moves
quite freely now by hand) up the point where I had moved it down before it
dropped.  Then, I powered the switch in the up position until the motor
made the sound of having reached the top.  I could then move the window
glass easily up to the top, but of course, it won't stay up by itself.

So, I suspect that something has gone awry with the regulator.  I'm
wondering if anyone has experienced this symptom (I've had parts snap, but
that caused other symptoms), and if so, whether or not it was repairable.
Does it sound like I need a new regulator?  I have a spare motor, but
given the freely moving window and the apparent functioning of the motor,
I'm guessing this isn't the problem.

Thanks in advance for any help and suggestions.

David
'87 westfalia