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E46 Convertible
The E46 vert forum. Talk about dropping your E46 top here.

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Old 06-27-2013, 01:57 PM   #1
Dave
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Noisy rear window

Yesterday I had the extreme thrill of being a passenger in my own car as we crossed Alligator alley. For a while I climbed into the back to see where one particularly annoying noise was coming from... obviously I'm perfectly well aware of the never-ending noise from the window edges up top (no matter how many times I run rags or towels through there it never ever ever ever gets clean as per the "quiet down your soft top" thread on M3F), but this one was different.

I can't quite tell what exactly it is, but it has to do with the rear glass. If I press on it, even with just a tiny bit of pressure, it stops making noise completely. If I let go, it's vibrating again.

I think part of this might be that my exhaust is so damn loud it causes extra vibrations (and man is it loud in the back seat... can't wait to get rid of it) but does anyone know what might be making the noise and whether there's anything that can be tightened/sealed to shut it up?
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Old 07-11-2013, 06:08 AM   #2
pcdriver
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Funny thing, I've had the same problem with both front windows making noise, very annoying, so I tried taking a bar of soap and with the door open, rub the top and side edge's of the window a couple of times until you have a thick layer on the window. The noise went away after a couple days and so did white residue. Hope this helps.
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Old 07-11-2013, 10:21 AM   #3
taylor192
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The windows might be loose. I tightened my front windows.
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Old 07-12-2013, 03:11 PM   #4
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This is my rear window. Inside the soft top. I'm not really all that worried about the side windows, even as annoying as they are. At least I know what that is.
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Old 07-22-2013, 09:05 PM   #5
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Got a courtesy consult from BMW Sarasota's convertible top guru today. We:

1- found a $5 parts kit for some of the screws and pieces in the rear section of the top assembly that should allow me to replace the bolt that backed out and caused my hydraulic leak
2- isolated the rattle in my rear window to the headliner being loose near two of the five clips that secure it to the window. Solution: tear up a little bit of foam and jam it in there. SILENCE!
3- waxed the top of my four windows. Jury's out on this one til more miles are put on it, but this too seems to have made a huge difference.

So I'll be throwing the little part kit in with my massive parts order for bushings, mounts, plug, coils, cooling, steering, headliner flap repair kit, etc. I think I'm going to drop close to $1500 on OEM parts in the next month or so to overhaul pretty much this entire car.

Anyway, one small but annoying problem is easily solved... hope maybe this can help someone else too. It's easy to diagnose when the top is starting to open if you stop it before the tonneau cover unlatches. You get a nice view and angle to reach in and mess with it.
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