I don't see why I need to connect a low side to the donor car or a high side to the recepient car...I was just planning on connecting the high side to the donor car's high pressure line, the "fill line" to the low pressure side (suction) of the recepient and start both cars and run both compressors. The natural flow will be from the high side to the low side. Sure, I won't get every drop out but I would guess I would get most out...

I think I can evacuate the recepient car before I connect the two and start from a vacuumed system on that side and purge the air from the hoses before connecting the low side...that would fill the hoses with refrigerant and eliminate most of the moisture ladened air from being transferred.

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Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz