I did say "If I were to carefully bleed it from the high pressure side of the donor system into the low pressure side of the recepient system..." in my original post...it probably wasn't completely clear that I meant to throttle the pressure through the valves on the manifold...

it seems there is only one way to find out if this will work and that is to actually try it...I'll report back and let you know how it goes.

I'll probably start out by just running the recepient car's compressor, like Richard Woolrich said above, and trying to "suck" out as much vapor as possible from the donor without running its compressor...it would seem this would work as well as charging from a can of refrigerant. I'll see how that goes then try the "power transfusion" if I can't get enough out initially. The principle seems to be to get the gas to move from higher pressure to lower pressure, but one of the compressors has to run in order to get past "equalized pressure". I'm just not sure if I need to actually run both car's compressors...it would go faster that way I am sure, but it may not be necessary.

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Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz