[HummerNewbie]

X2 on what kind of rattle. About 5 blocks from the dealership the night I picked mine up I hit a bump (not a big one either) and something broke in the sunroof. If would then rattle whenever you hit a bump and would pop up on the front right corner of the sunroof when you shut the doors. You could sit there and push it up and down. On mine it had something to do with the adjustment screw right there near the front right corner. They put in a temp fix while they waited on the part and no noises since.