My sunroofs on my 300 Tdi have both rattled like mad when either tilted or fully open since I have owned it.
Today I finally got a set of steps and i climbed up above the roof and I looked from the outside while my mate looked from the inside, we found both had loose screws holding the glass in place.
It was a bugger to get a torx bit in a 8mm rachet spanner into place but with a bit of fiddling I got them all tightened.
What joy it was driving home with the roofs open and no horrible rattle driving me mad, so if your sunroofs rattle it could simply be a few loose screws.
Today I finally got a set of steps and i climbed up above the roof and I looked from the outside while my mate looked from the inside, we found both had loose screws holding the glass in place.
It was a bugger to get a torx bit in a 8mm rachet spanner into place but with a bit of fiddling I got them all tightened.
What joy it was driving home with the roofs open and no horrible rattle driving me mad, so if your sunroofs rattle it could simply be a few loose screws.