I have friend who I guess is in his 70's-he's always been a Cadillac nut. One of his stories involves a car from the early/mid-50's. He and a friend added AC by rigging up the internals from a window unit. It was old enough to use a belt-driven compressor. Apparently they ran it off the engine, plumbing lines to the rest of the system in the trunk, and it worked quite well.
I have a binder of sales literature for the '76 Chevrolet and it includes a flyer for dealer-installed AC. These were more of a custom fit than the aftermarket units but still looked tacked-on.
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Bryan
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