Calling Golf Mk III experts - Roger Jones
This is a bit silly, but someone may have experienced the same thing and zapped it successfully.

You remember the Golf III ads of the early 1990s, in which a squeak heard inside the car was finally traced to the girl's ear-ring? I have a high-pitched squeaky rattle coming from the sun roof of my 1996 VR6 and I cannot pin it down. It is audible with roof open or shut and is still there when I close the internal sliding bit. It sometimes goes away for a bit when I thump the ceiling in annoyance, but it always comes back. Any known cures out there?
Calling Golf Mk III experts - ammo
hi, just a quick question please. I also have a 1996 Golf VR6. Do you have traction control?.
Calling Golf Mk III experts - Peter D
Often this is due to the screws around the guide channel coming loose. Also use lithium spray white grease and lube the bowden cable that drives the roof and it should shut up. Regards Peter
Calling Golf Mk III experts - RoadDevil
I had something similar with a Vectra, went away for a bit if you poked/slapped the headlining. I dismantled the interior light/sunroof control swith trim panel and discovered it was the wiring to the sunroof switch vibrating against headlining. altered the routing of the wiring to what it looked like it should have beed inthe first place - problem cured!