This is something that a gentleman told me about leaking windows,I notice In a few posts people saying they wouldn't bye a van with a front window a lot have a problem with water leaks,I am one of them with a leak,well what this gentleman told me how he fixed his is what i have done with ours and guess what it is fixed, so what he told me to do was put a length of aluminium gutter strip across the top of the window frame about 6 inches past the end of the window frame each end,attached by using double sided tape from Repco, he had put them over every window and door on his van,I asked him did he have any trouble in the hot weather with the tape letting go his answer was no no problems, I have put in a pic to make it easier to understand what I am trying to explain, I haven't tested it driving in the rain.
Great idea!....logical and so simple which is always the way with good ideas. I won't need this for my Avan but I have a shed window that leaks and the gutter idea would be ducks nuts.
Regards