Aye Up,
I’ve recently had this problem on my D1 and spent several weeks tracking down one, then several locations each of which provided a different access point for water. No sooner did I think that I’d sorted it than water reappeared.
One of the things that I did was to ‘puff’ talcum powder on the footwell sloping footboard to highlight water tracks.
I tried to post a write up and images of each but every time I did I received a message saying that the post was too data heavy.
Here is a list of the locations and one image, I will post images in subsequent separate posts tomorrow to see if it works that way.
Unserviceable Sunroof seals - glass-to-frame and/or frame to roof;
Damaged/disconnected sunroof drainpipes (front). Pipe runs down inside of FNS A-pillar;
Junction of bottom of A pillar/inner wing/scuttle
Windscreen wiper motor housing gasket
Heater air intake gasket
The Seam running the full length of scuttle and covered with filler; looked ok but had dried and become porous
Gap between inner and outer wing local to base of A pillar
Spot weld joining scuttle to bulkhead panel. Water seeped through this, down bulkhead onto cable harness and through to top of sloping footboard.
Alpine window seals.
