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The engine is the logical power provider for an AC compressor. The only way I can think of to have an AC system is they way they install them at the factory, so it makes sense to just go with that type of system. You could try running the AC compressor with an electric motor, and even relocate the compressor if you wanted to. Early AC systems (40s, 50s?) the system was in the trunk, no idea what powered the compressor or where it was.
Gilly
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