Our 2001 was doing the same thing when we bought it. I opened it partially and felt around and pulled out a long metal strip that had been glued to the back edge of the glass. When I got it out, the rattling was reduced (the strip was bouncing around), but not stopped. I think the purpose of the strip was in the closed position it keeps the glass from bouncing up. From the outside, I can bump the sunroof with my hand an it will bounce and rattle.

Ours does the same thing. No noise when open. Only when closed. When the shade is pulled, it is more quiet. Roads in TN are not as bad as MI and until the wife complains enough, I won't pull the headliner and pull the sunroof to fix it.

A few years ago, I had to pull the sunroof our of our 850 wagon and not a difficult job, but did take 5~6 hours to get it out and back in. Ended up with a few dirty finger prints on the headliner.

It sounds like yours is the same as mine.

Keith
1996 855 GLT 327K, '01 V70 T5 120k.