If you have compressor failure the contamanation is likely through out the system and flushing is not going to remove all the debris. Eventually the replacement compressor will be compromised. I have four w201's all with working AC. Three on 134 and one on it's original R12. The smaller molecule size of the 134 will allow it to leak from a lot of places I think over time it slows and eventually stops at least that's what happened for two of my cars. I am here in the south so AC can be worked hard and the 134 is defiantly not up to the task in sitting and slow moving traffic. I am keen on the ES 12A, annectodatoly I hear it blows snowflakes sometimes.

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Charlie

85 2.3-16 ECE Track Car "Connie"
86 2.3-16 Slushbox Devils Stepchild. "Red"
89 2.5-16 ECE. Bimmer Eater "Sophie"
02 ML 55 Towmeister "Gertie"