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

The two earlier replies were mine. I have no idea why they were deleted. They referred to inner mechanism that raises/lowers the glass being worn, as the likely source of the noise. I suggested that you try to tip the glass up and back while raising it, and see if the noise changes or goes away. It does in my car but I'm not sure which internal piece is bad yet.

Hello all,

I had two responses to this post and somehow they were deleted?
They suggested that there is some part s at the bottom of the glass to seat the windo right.
The new glass seal did not solve the problem, does anyone have details
to get the glass to shut properly?

Thanks, Bill 1989 740GL sedan

the noise sounds like the same as my car and is caused by the glass tilting in the frame, not the rubber. There's some part in the mechanism that raises/lowers the glass and wears, and lets the front of the glass tilt.
Try pushing on the glass near the top front as you raise the window; push it a bit up and back and see if the noise goes away.
To fix, you have to disassemble the door innards but I'm not yet sure which piece is the right one to replace. There is a blue plastic piece, one at each end of the glass, and there's a white plastic piece that connects the two metal scissors. It's one or the other I believe.

the noise sounds like the same as my car and is caused by the glass tilting in the frame, not the rubber. There's some part in the mechanism that wears and lets the front of the glass tilt. Try pushing on the glass at the top front as you raise the window; push it a bit up and back and see if the noise goes away.
To fix, you have to disassemble the door innards but I'm not yet sure which piece is the right one to replace. There is a blue plastic piece, one at each end of the glass, and there's a white plastic piece that connects the two metal scissors. It's one or the other I believe.