OK, so this has gone on long enough, I have mentioned in a few places on the forum, but since I have had my 944 it has suffered from a wet passenger rear footwell.
Now, I have spent some time checking the usual places, including the following:
Sunroof seal (this was replaced before I bought the car)
Sunroof drains - running clear, no cracks
Fuel filler drain - this was detatched, I have rejoined and it is not draining OK
Hatch seal - this does leak some water over the drivers side rear seat, but only if water is sprayed at it from a hose
Tail lights - these were leaking a touch, so I have resealed
Hatch latch seals - these are leaking, I need to replace these
Blower cowling - this was leaking where it was cracked and deformed, I have repaired, reattached with foam tape and siliconed any areas where it is deformed along the top edge
Blower unit - I have removed this, cleaned and resealed
Now, the water does not seem to be getting the front carpet wet, is only on the passenger side, and runs from the box section just in front of the seat mounting point.
I have borrowed a pic from someone who had the same problem, but never resolved it as far as I can tell (his was drivers side, mine is passenger):

Mine appears from the arrowed area just behind where the box section meets in the inner sill.
After persistant rain (say all night), I will have water sitting in the footwell where it has ran from this point. It is not loads at one time, but when the carpets are down it will get to the point where it soaks through.
Since I have done all of the above it still seems to be getting in through from the bulkhead area. I have ran water all over the car, and although difficult to pin point as it takes a while before the water appears - it definitely seems to come from the bulkhead area.
Today I ran 10L of water over the lower passenger windscreen area and some time later I had a small amount of water appearing from the box section as above.
Other than what I have been through, does anyone have any ideas on this? It is possible the seam sealant in cracked along the bulkhead somewhere, but I haven't found anything obvious, and I can't see it running in anywhere along the firewall.
For anyone that has the carpet stripped out, or knows the body structure of these cars well, is there anywhere that water could run into this box section area, without running down the firewall or getting the front carpet/floor wet?
I have checked the inner sill and can see no obvious signs of water gathering in here. The side carpets are not wet either (I have read that some people have had water running into the cabin from the bulhead drains, where the seam sealer has failed along the inner wing).
I will carry on with this over the weekend, but so far I have spent a long time and found a number of minor leaks, just not the right one yet!!
Any suggestions appreciated
