From what I have learned R134A is a very poor replacement for R12 and to make matters worse it is only marginally better for the environment. When you factor in all the botched up AC systems that some (not all) users end up with, much of this stuff ends up in the atmosphere....much more than properly maintaining R12 systems. The host of other Freon blends are also cr@p for the most part IMO.

My 92 w124 had R134A when I bought it for my wife and it had the condenser blow and that was the end of it. Head pressure is greater than that in an R12 system.

I searched for a Freon replacement for my 90 w124 and tried Red T? it was garbage and did not cool at all though we followed installation/conversion instructions to a T.

I searched some more and found SP34E {Liquid charge ONLY} {80% to 90% of R12 charge} for me it was a direct R12 replacement. The system was properly evacuated and charged, it works very well but it has only been in for one year.

I do think that many AC systems are damaged when some people who lack proper tools, equipment and experience try to work on or diagnose rather complex AC Systems. I have also heard QUOTE " my buddy fixed my AC, he knows a lot about cars but now it doesn't work eh?

I didn't actually mean to write all this, oh well,
Acky