Water leak from A-pillar - Help Needed -

[golfpaul]

Hello all.

First thing first, I have no sunroof.
With that in mind, what would be causing a leak from the drivers A-pillar where the trim meets the headlining, its quite bad as in the morning the seat is very wet and the car full of condensation.

I'm struggling to find any kind of diagram of the drainage lines in that area, remember - for a non sunroof.

Any help would be greatly appreciated as its really winding me up

Thanks.