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Originally Posted by alabbasi
Freeze12 really isn't a good alternative for R12 as it's 80% R134. IF your going to go that route, you may as well convert to R134 and be done with it.
I have used R406a in my 280SEL. It is the only drop in replacement that I know of for R12 as it can mix with the oil. It turned my fingers blue while it was in there, but it appears that I had a leak in the system and as a result, it didn't last very long. I guess I need to replace the compressor and 34 year old hoses.
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Here is a blurb that I copied from
http://www.imperialclub.com/Repair/Air/refit.htm
"Now let's compare R406a or GHG-X4:
They are MORE efficient than 12, yet operate at similar pressures,
so the expansion valve calibration will remain optimal and your
existing condenser and evaporator will function MORE than adequately.
They are completely compatible with R12 type oil, so no system flush
or expensive compressor rebuild.
You still need new hoses, because R12 type hoses are permeable to the
smaller R406a factions' molecules.
Ditto new seals. (New hose-to-hose and component-to-component seals,
you don't have to mess with any compressor or other internal seals). The choice is crystal clear here, isn't it?
Now I have to ask YOU a question:
Why are you converting to anything?
R12 is still around, you know, and anyone who tells you otherwise is
lying or ill-informed. There is plenty of it in the US. There is MORE
than plenty of it in the US. Some garages will tell you that R134a is
the only legal refrigerant. That's wrong. Some will tell you that 134a
"moves more heat" than R12. That's also wrong. Some will tell you that
no flush, rebuild, or anything else is needed when converting to 134a.
That's dangerously wrong. Either use 12, or use 406a, or use GHG-X4.
Any comments from Forum?