Investigation revealed a very wet back end, with water sat on the engine cover. It's a campered up high top, but the walls weren't wet and the seal round the tailgate looks fine.
On top of the engine cover is a plywood board with some thick felt on the underside. Both parts soaked through.
On top of that is a carpet. Bone dry, except in the back nearside corner.
So, where does this water come from
A very scientific investigation reveals that if I pour water in the gutter rail at just the right rate, it trickles out of the end and snakes off *inside* the air vent thingy on the side. I don't think it's meant to do that.
It then seems to disappear altogether (magic!) in that it never arrives at the bottom of the van. So, it looks like rain water is getting in the vent, and magically popping out again at engine-cover height. I can't really see how!
Hopefully someone else has seen this and can point me in the right direction. Failing that, how do I stop the water from the gutter trickling into the vents. Surely that's not supposed to happen. The water is following the 'curve' of the body panel and almost running uphill to get to the vent!
Oh, and is there an easy way to get green slime off plywood?
Ta.
