Scott,
You should add the oil to the compressor and drier before closing off the
system for vacuum. The vacuum pump should not suck out the oil. I
converted mine to R-34 so I am not sure what oil you should use for R-12.
Normally it is recommended to replace the expanision valve, but after
removing a couple and replacing them the old ones looked like new. It is
not easy to get to the one on the Bricklin so I would risk it and try it
without replacing it.
Greg 0036
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