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I just went to the junk yard to look a a/c compressors. I took apart two, both swash plate piston style. Both didn't have a rotating orifice plate, only reed valves which do not allow the pump to run as a motor. I looked at a lot of different cars but all seemed to have the same style of compressor, at least they look the same from the outside, nothing that looked like it could be a scroll compressor.
One exception was the compressors found on the older chev caprice, it had a more pancake shaped compressor. I could see into the compressor form the intake port and it looked like a radial piston setup. I covered one port with my thumb and turned the shaft both direction. It produced pressure from the same port regardless the the direction the shaft turned so this suggested to me that it also had reed valves.
from this trip it seems that auto a/c compressors are a dead end. Unless someone knows of one from a specific car model.
bschloop you said you were able to turn a compressor with compressed air. What type of compressor? And what was it out of.
just as a side note the first unit i looked at had about 1" dia pistons with 1" stroke X10 which works out to 128cc displacement. A lot bigger than i thought it would be.
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