JapCar said:
I tested system today and everything works as required, I mean answers of all your questions (1-4) are Yes.
After topped up, my concerns are just noisy compressor (if it isn't overfilled) and turbulence on small window (insufficient oil) instead smooth stream with a little bubbles.
I'm now very puzzled by two things
1. If there was a problem with the operation of the flow of hot and cool air through the ducts, I don't see how filling the pressurised pipes with more gas has solved that
2. If the diagnostic display previously correlated with a problem with the flow of hot and cool air through the ducts (which seemed to be the case), I don't see how the diagnostic system no longer correlates with the actual system now that the actual system is working
With regards to the compressor being noisy, that is a potentially "subjective" thing, because you should always be able to hear the compressor coming in and out. Having said that, there is the possibility that the entire system is running in reverse, because the system in the diesel does run in reverse when the outside temperature is below +5 C ....if the main temperature sensor is indicating -ve C temperatures, then the system could now be stuck in reverse.
Regarding the bubbles, same apples ....it's subjective, and/or the system could be running in reverse. But anyway, AFAIK, the bubbles have nothing to do with "oil", the bubbles indicate that the refrigerant gas is compressed to a liquid (that's how all refrigerant systems work, they compress the gas to a liquid, which then expands at the evaporator back into a gas).
edit: the above is very badly worded but tonight doesn't seem to be a good time for me to type stuff (although I'm not sure that I can explain it better without making it even more TLDR, there are potentially very many "if'ss, buts, and maybe's" to go through)