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Originally Posted by ABMR2
So if I wanted to fill up w/ ES-12, I'll need to flush my system? Do E134 and ES-12 don't get along?
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ES-12a is "mechanically compatible" with both refrigerants. It's not legal in the USA to mix refrigerants, so you're simply not supposed to do it.
Better yet, why let the inferior R-134 take up the space that ES-12a could occupy? You'd have a less than optimal system, and you'd feel the difference.
You can charge ES-12a into a system with zero pressure (no vacuum) as long as you know that's it hasn't been open and has no air in it. (Air will displace refrigerant, and it carries moisture.) It is always best to pull a vacuum if you can.
And no, you do NOT need to flush your system. I would add an ounce or two of Ester oil if you could.