My 03 xjr has a rattle coming from the sunroof area over slight bumps. When sunroof is open all the way or in vent position it does not make the rattle only when sunroof is closed. Any ideas. Our 03 XJ8 does not make the rattle.

 

When I first owned my 1999 XJR I heard what I thought was a rattle from above...turned out to be the flexing of the leather dash corner against the passenger door panel...please let me know.
Cheers!