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Usually, in my experience. When a compressor goes bad, it grenades internally and sends metal throughout the system. If there is indeed metal in the system, flushing just the lines and replacing the dryer wont do you much good. You'd have to flush the condenser and evaporator as well. Most of the time its easier to replace these items, because its nearly impossible to get all the metal out of them. Any metal that had not been flushed out, is only going to kill every compressor you put on it. Possibly adding even more debris to the system when the new compressor grenades too. The expansion valves can also get clogged with debris when this happens.
The amount of oil is really important as well. Im sure you know this. Too much will cause excessive pressures and create more heat, having a negative effect on cooling performance, and can also cause the compressor to fail. Though usually they just vent themselves from the pressure relief on the back of the compressor. Too little, and the compressor fails due to insufficient lubrication. Usually they fail by seizing up or exploding parts internally.
I'm not saying this is your issue, because I'm not there looking at it with you. But A/C systems arent overly complicated. I worked on development vehicles when Ford was implementing r123yf. We were replacing parts, pulling dashboards, weight oil, blowing up compressors, measuring debris, weighing components before and after flushing and doing just about everything you could think of to the AC system of these vehicles. Needless to say, I've done a ton of this stuff in the not too distant past. You tend to learn how and why some of this stuff works.
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