The poor man's fix on the window channel is to take the window channel out of the door at the top of the window only........you want to do this somewhere along the top of the door where it is horizontal so that way you have less of a chance at it leaking there.......and cut the window channel rubber with a pair of scissors or utility cutters like these......
.....all the way through. Then pop it back into it's channel in the upper door frame and push the two pieces away from each other so that both of the corners line up as they should. The 90