Good evening, May I ask why you want to change the compressor please? We are apart from other things licenced to work on AC systems as we sell and repair American Motorhomes, I have carried out a fair bit of research on the change over from when R12 was the normal gas to use, to what can now be used safely, this I have found to be R413a (which also has another trade name). From the research, R413a can be used in a system that previously ran R12. I will be carrying this change over out on my own RR Shadow II in order to prove it. The one other advantage of R413a is the fact that the coefficient of this means that it even offers better cooling than the old R12, and that in itself is fairly remarkable whilst also being a non-Freon gas. We have one other resident of our industrial estate that repairs and restores classic cars, at the moment he is doing an Aston Martin DB6, so this is another we will be refilling it after a vac and check. I have to say I will be also replacing the 'O' rings, but I do not HAVE to, its just me. But if you are doing it to simply change from R12 to R134a, you do not have to. On a final note, the old mineral oil is compatible with R413a as well. The only downside I have found so far is that it is not that cheap, but neither is changing the compressor nor the possible other damage that can occur, the bonus is the better cooling that it offers. Kindest regards, Simon (Mercury RV)
Last edited by Mercury RV; 06-17-2017 at 05:47 PM.