Hopefully I will not write too much here having had classes in the non-mobile types of A/C and have worked on various mobile systems for years. There is a stigma attached to retrofits and the oil compatibility of each. 5% mineral oil is the max recommended for a small hermetically sealed system, the rest should be an ester based oil. Having said that mobile units use PAG oil which is different. Using a recovery unit usually removes most of the oil from the system during the recovery cycle. When recharging add some PAG especially if changing the compressor.Of course if fixing a 134A system and have the refrigerant it can go back in if recovery was done correctly. Most repair stores require changing the accumulator/drier and the metering device if a standard orifice. Oil return on mobile systems does not seem to be a problem as the velocity of the refrigerant is enough to get it back to the compressor and the compressor is different than the sealed motor/ pump units that have electrical windings in them. Flushing really applies to burnt wires in the electrical motor which you do not have , so flushing isn't going to help a lot. So fix the leaks, changing the o-rings as mentioned before, vacuum for a long time if possible(500 microns if you have a gauge but mobile systems are hard to seal for that quality of vacuum) and recharge to 80% by weight or by the correct volume if using a sight glass. It should be fine, I have done quite a few over the years and they last quite a while but due to the shaking and such will eventually leak. Occasionally I run across a system that does not leak which is great. All the rest of the posts are good info also if I missed something.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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