So far this is what I have gathered as the correct "process" of refilling the system after rebuilding it. This is assuming you have replaced all the o-rings, parts, etc.

1. Add oil to the system in various spots so that it is easier on the system to circulate.

2. Add PRESSURE to the system to check for leaks, etc. with 4oz R22 in, CO2, or Dry Nitrogen.

3. Once pressure has been added and no leaks detected, vacuum down the system to remove moisture.

4. Add freon of the proper amount to the system and "pulse" the compressor to get it circulating.

Is this correct?

Also I'd love to see opinions on different compressors and what makes certain R4's different from others and what the CORRECT R4 compressor for our car is.