Factory A/C System Flush?

[RichardJ]

>>Sorry it’s 134 and ester<<

So, it's a system with Mineral oil and you really can't flush a compressor, other than with hand pumping new Ester oil through it. Although I read on the forums some try to flush with solvent, or at least they think they are.
I separate the condenser and evaporator from everything and flush in both directions until fresh solvent flush goes out clean as it went in.
Nitrogen would be better, but I use compressed air with a moisture separator and filter. After I have it partially buttoned up, I purge the system with the 134. I know, you're not supposed to vent that much coolant out into the atmosphere. You do it again, to a lesser extent, when you purge the gauge lines.