Hi all, my 520d seems to be leaking water into the interior from somewhere. Its only on the drivers side and both the front and rear carpets are soaked through. Please help

It hasn't rained since drying it
The water smells a bit stagnant
Seals look fine
English car

 

Use leak dye to help find the source. Could be your heater radiator leaking.

 

I just did this and it took 20 seconds to run a wire up into the clogged hose. It had a mud-dobber nest inside and about half a gallon of water came gushing out as soon as I broke it with the wire. This problem has been going on for 3 years and in 20 seconds I was able to remedy it thanks to this video! No more water draining out onto the feet of my passengers, lol!