Passenger window has movement that shouldn't be there. Originally thought same as Z3 with the white clips that are fragile and break (well after 20 years its acceptable) so bought the clips as states Z3 and Z4.
No clips on the Z4 but after a visit to a nice American on you tube he explains how to tighten a loose Z4 window
Remove door card (already off) then peel back the membrane slightly at the bottom corner near the lock there is a hole about 3cm diameter first you need to line up the hole with a 45 torxs bolt, thread the torx screw and tighten. Unfortunately no Torx bolt? after a feel round found bolt in the bottom of the door (so thats what the rattle was)
Fitted bolt tightened, not too much as it secures the glass job done, now its snowing again.
If you have a similar issue the video on You tube explains and shows how in simple English
No clips on the Z4 but after a visit to a nice American on you tube he explains how to tighten a loose Z4 window
Remove door card (already off) then peel back the membrane slightly at the bottom corner near the lock there is a hole about 3cm diameter first you need to line up the hole with a 45 torxs bolt, thread the torx screw and tighten. Unfortunately no Torx bolt? after a feel round found bolt in the bottom of the door (so thats what the rattle was)
Fitted bolt tightened, not too much as it secures the glass job done, now its snowing again.
If you have a similar issue the video on You tube explains and shows how in simple English