I am an auto tech and have literally performed 100's of retrofits over the years. Here is what you need to do....
1. evacuate the system
2. pull a vacumn to "boil" off any residual moisture
3. charge retrofit oil, most kits will use ester oil as it is compatible with both R12 and R134a oil
4. charge refrigerant to 80% of the R12 capacity.
That is it.....Done. No need to flush as the R134a won't "carry" the R12 oil so it just sits in the bottom of the system, that is why you need to add retrofit oil, it is also part of the reason you only charge to 80% capacity, the old oil is taking up some of the capacity.
When we first started doing these there where a lot of myths around about having to change lines and compressors and anything else you can think of, it is just false. the only real difference in the two systems is the oil, the seals and hoses are all made of the same material.
I will however say that it would not be a bad idea to change the receiver/drier or accumulator (whichever your system uses) This part contains a dessicant to absorb moisture, If the system has been flat or open for any length of time the dessicant is most likely saturated and can no longer do it's job. This however has nothing to do with the retrofit, just a good preventative measure on a system that has been idle for a long time.
Hope this was helpful, sorry for being long winded
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