Noticed a pool of water in my rear passenger footwell following recent rain. Pulled off the door cards and resealed the door vapour barriers that were loose / unstuck in places. Car is still leaking from somewhere !!! Anything else I should check investigate as a source of leaks? I checked scuttle panels they are draining fine, door drains are all working. Could it be the heater fan intake seal ? no idea where is is (left or right side)

I don't have a sunroof and the car is a 2008 LCI M Sport.

 

Sunroof drain. Comes down the back side pillar. Surf around for that and you'll get some threads and photos.

 

Doesn't have a sunroof?