Thanks for the thoughts on my mystery vacuum/pressure lines. Given that some lines go to the dash temp controls, I reasoned that it might be some kind of a vacuum generator. Thanks for backing up this line of thought. Seems like an odd way to make vacuum, but, whatever. I did try the vacuum (pressure?) driven wipers and was surprised to see that they still work. As for the dash air conditioning, it has never worked and so I can't really trial this suggestion. Unfortunately, I still don't know where to hook up the third line. Given the 18" length of this tube, which defines the radius of options, one would think it not hard to find where to hook up the tube. Yet, despite my efforts and even efforts from other family members, none of us can figure out where to hook up this last line. I remain open to suggestions by any other classic owners, who may have the same set-up in their RV.
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