My sunroof made a rattle too. The fix was easy. One of the nuts holding the
sunroof panel's brace was loose. The downside is that there is risk of
damaging the sunroof headliner panel mechanism. If you want to try and fix
it, do it at your own risk. I did, and broke the mechanism :(
First, you'll need to separate the headliner panel from the sunroof panel.
To do this, activate the sunroof as if you were going to open it, just so
that the rear edge of the sunroof panel drops a little below the roofline
Now using the palms of your hands, with a swift motion, push the headliner
panel rear ward so that it separates from the sunroof panel.
Note: DO NOT OPEN THE SUNROOF PANEL (RETRACTING IT INTO THE ROOF) WHEN THE
HEADLINER PANEL IS IN THE REAR MOST POSITION. DOING SO WILL DAMAGE THELINKAGE OF THE HEADLINER PANEL.
Now that the headliner panel is slid back and out of the way, you'll see a
black brace going across the sunroof panel. There are 3 nuts that attach
this brace to the panel. Those nuts tend to get loose, and cause the brace
to vibrate against the panel, causing the rattling noise. Snug them down to
eliminate the rattle.
Now grab the headliner panel and slide it forward, reattaching it to the
sunroof panel. Tada, you're done.
> ok, my stupid sunroof rattle is driving me nuts. Anyone know how to fix
> this? I'm guessing this is going to involve taking the sunroof apart,
> but I have no idea where to start. Does it come off from the top? Or
> do I need to take the entire headliner apart?
> -kit, who is annoying and considering welding it closed... ;)
> 97 m3