The drain holes are situated to the front of the car, open sun roof, you should see/find two holes which drain any water away from the channels, if these are blocked water will enter the cabin, I use the cord you use for a flymo/grass strimmer and poke it down/up n down to clear the drains, they either come out below the windscreen or in the wheel arch, normally if you do the above and pour some water in the channel at the same time, the water should disappear and you will see it somewhere on the floor under the car, on a dry day of course!!.
__________________ VELVET BLUE UK INDIVIDUAL , IM THE LAST
UNITED WE STAND DIVIDED WE FALL
I stepped in a plate of Pasta the other day - now I have to worry about my Carbonara footprint!