I'm normally parked on the level at home and other than slight ingress in the boot, the cabin stays bone dry. Yesterday I had to park facing uphill and we had heavy rain during this time, come late last night and I'm off to fetch the wife from work and instantly hear this gurgling sound which progressively got quieter after 5 or so miles, wife opens the door to get in and spots the water on the floor straight away.
So the noise I heard was, I guess, the fan I noticed when changing the pollen filters last summer, churning the rainwater that had got in there and flung it out the foot vent?
The p38 is quite new to me but can anyone confirm my thinking that rainwater in the fan housing can only get there via the pollen filter lid?
It's never leaked in before but this is the first time it's been parked facing uphill which may be a clue..
TIA.

OK. Think I've found the issue, not the pollen filter lid but the screw holding the trim on immediately above it. This goes into the pollen filter housing and with the pf lid off I could see drops of water hanging off the end of this screw. Bit of dum dum and cured I think. Makes sense now why it's never leaked in before until I parked facing uphill, rainwater can pool a little in this area but not so much if parked level.

i need to check this out on mine.

Its always parked uphill and definately gets damp on the inside if its raining (though no visible puddles)

If it's coming from the feet vents it has to be, I think, pollen filter lids, pf gaskets or pf screws or the single screw just above the pf lids. On the drivers side, same, but add matrix leaks to the search. I had water or rather antifreeze out the drivers side feet vent which was the O rings.