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Oops, forgot to answer one question:
One of the water-air heat exchangers (the one on the front of the car) is indeed just a radiator. You could repurpose the center radiator on an S (or install one on a base) to use as the "condenser" on a W-A system... (The other water-air exchanger, the one back in the intake tract, is usually one specifically designed for that purpose, look for Spearco intercoolers, they have good pictures and some docs (I think they got bought by somebody, I had them fabricate a big IC for one of my quattros a few years ago, the link I have is dead now).
Eric
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