Quote:
Originally Posted by dstorey
The mention that 134A conversions fail. The problem with conversions is that while 134a approximates R12 it is less effecient and a system not designed for it has less margin. The other problem is that 134 uses different oils than r12 and needs different seals. So what everyone does is replace all the o rings with nitrile or something that is compatable with the oil forgetting that there are seals in the compressor. Also all the old oil needs to be flushed out and a new receiver dryer installed
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The problems with original R12 systems converted to R134a go MUCH farther than the seals or any other leak issue. Converted systems run higher high side pressures putting more stress on the compressor and all other high side components. Aggravating the problem and contributing to the statistical failure time line is the fact that many conversions do not get the proper attention to lubrication as you describe.
As I said, statistically, converted systems experience problems at the two year mark. This is fact determined from carefully recorded data, not imagination or wild dreams.