Why do i now have a mini pond in my car...?

[n0v0s]

After sorting my heater matrix, i am greeted the next morning by a puddle residing in the passenger side floor well. As i have rubber matts, the water just remains. It's rain water - not coolant (matrix not leaking), and only appears after a rainy night (not while driving through rain). I think there is also a much smaller amount collecting in the drivers side.

What have a forgotten to bodge/refit? I'm guessing it is something to do with a drain? Seeing as it only happens on standing?


Also, I finally have HOT AIR a welcome change after 10months of numbness.