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I'm looking at a 91 164. It still has R12 ac. I live in Miami, FL, how hard (and expensive) is it to get R12?

Second, I'm an ok wrench, so how difficult is the conversion and about how much would it cost to convert to R314?

I seem to remember that there is a propane refrigerant out there that you can just put into an r12 system without having to make the usual modifications when converting. Anyone ever try this?

Thanks.
 

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I remember geting my 1991 164 re-gassed in 1998 & 2000 - I was told that the original refridgerant was no longer available but that they would simply use a different spec.
 

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I believe there is a variety of alternative "drop-in" refrigerants and I would have thought that any aircon specialist in the 'States would be able to advise you as there are far more old R12 cars over there than here. If you really wanted to change to R134a, I think it's quite an involved task. Every O-ring, seal and hose in the system will need to be changed (including whatever is in the compressor). Technically, I believe that the condenser needs to be a bit bigger because R134a isn't as good a refrigerant as R12. I imagine you'd also need a different expansion valve and receiver/dryer. That said, I also think (but am not 100% sure) that at least the whole 164 aircon system can be accessed from under the bonnet, so you wouldn't have to take the dash out to change the components.
 

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See my previous postings on RS24, as fitted to my 1990 164 by an air-con specialist. An R12 drop-in requiring no mods to the system, and ice cold.

You can also get off the shelf product drop in product called Freeze-12 in the States, though not tried it. Comes as a kit with its own style Shraeder valves, oil, leak seal and refrigerant.

Be careful if an air-con "specialist" is filling your car A/C with propane. Yes propane will work as an A/C gas, though is too flammable to consider using in a vehicle where there are risks of a collision venting the gas to hot exhaust and sparking metal/electrics
 
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