I was quite surprised when I searched Brickboard for "window regulator", and found
that my "Whistling Window" problem seems to be a chronic Volvo problem;89 740GL.
I found dozens of people reporting that the drivers window didn't close right, yada yada.
It seems that of the dozens of posts, people wind up replacing the regulators.
No one seems to have found the regulator repair.

What do you know?
Notes:
*I can't find FAQ, as the drop down links are inoperative. (I just need the file name)
*There seems to be no slack to adjust the regulator assy with the 4 studs.
* The sector gear doesn't run true. Something deformed.
* There's a LOT of slop with the scizzors and from the way It's working,
I'm guessing that either one or both arms is bent, or something screwy
at the pivot/s
*I haven't removed that assy to get a good look at it. Does the glass remove
easily from the regulator?

The drivers window doesn't close right in the upper rear corner. The glass is
falling forward some, to fall slightly out of the window seal that looks OK.

Maybe someone has "been there, with the T-shirt" and all?

Thanks, Bill