MK2 PAS is notorious for not being able to put enough tension on the belt, due to bent bolts underneath.
There is also a splash guard you can get which helps prevent the belts getting wet, check out the part numbers thread

I got mine off a late Jetta in my local scrappy for some reason it seems VW put all the splash guards on em even if they didnt have power steering, they even got little extra splash guards which go on the bumper under the fog lights!.