Back to my air wiper problem

[Lin]

Just the outcome in case anyone is interested.  The wiper is now working.  I changed the way it was plumbed and, although I am not sure of how the factory did it, it now works.  It also seems to me to make more sense then the way it was when I got it.  Not only did it have a direct, unregulated air supply in addition to the one from the control valve ( which was connected to one of the pk ports), the exhaust which seemed clogged, turned out to be connected to the line going to the old, disabled door-closing cylinder.  I had trouble tracing it out because the tube was red at the dash, but had been painted gray when it went through the floor.  It's just amazing what someone can do!  Thanks to everyone for the posts.  Thanks also to JL for the phone time and general hand holding.