@Buggirl . I thought it could be caused when I opened the door but mine has twin side doors so I leant over and there is a puddle in the footwell of the other door and I hadn't opened that one.As far as I am aware they are visible when window is open? I had this as had never used my side windows. Whilst I was away in the Peaks my friends sat in the back and kept opening and closing the windows and no leak!?! The big test will be this morning as we had horrendous rain last night but let's see. I will keep you posted.
Oh and one more thing, my sliding door window was the only one that appeared to leak and I can't help but think that the action of physically opening the door causes any rain caught in the gutter that hasn't gone down the drain hole properly to 'jump' out as you pull the door open.
Hopefully if weather is better tomorrow will be stripping out the front door and kombi windows.My front door leak was caused by the seal that the glass rubs against at the bottom, the front inch or two by the wing mirror was not fully against the glass and letting water past
Best way to fix is put some silicone grease on the rubbers ,one of mine leaked after a few weeks old .so the drain holes weren't blocked .vw changed one on my old kombi ,it still leakedThis is an oldish thread but guess what... both of my sliders are leaking . Preparing to tackle dealer with a number of warranty issues including this!