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Convert R12 AC system to R134


Big Josh

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I have a 92 4.0ohv Ranger with an old R12 ac set-up. Option one is to convert the system to R134-change compressor oil and ac fittings. The second option is to convert the entire system. I live in a wrecking yard paradise that has tons of 94 Explorers, so parts are affordable. What parts do I need to take to convert the system to an R134 system-compressor and what else; is it worth it?

My current system is completely empty, and I plan on changing all the o-rings if this matters. I know I can just get it filled with R12, but that is not the route I want to take.

Which option would you recommend and why? Thanks
 


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black_demon69

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I have a 92 4.0ohv Ranger with an old R12 ac set-up. Option one is to convert the system to R134-change compressor oil and ac fittings. The second option is to convert the entire system. I live in a wrecking yard paradise that has tons of 94 Explorers, so parts are affordable. What parts do I need to take to convert the system to an R134 system-compressor and what else; is it worth it?

My current system is completely empty, and I plan on changing all the o-rings if this matters. I know I can just get it filled with R12, but that is not the route I want to take.

Which option would you recommend and why? Thanks
rebuild the system IE replace o rings, hoses, accumulator, orifice tube with new parts. flush evap core and condenser with a good ac flush. drain compressor and fill with full charge of ester oil and a/c dye if you wish. also clean condenser cooling fins. should have blue orifice tube but red will make it perform better.

if it was me i would just replace compressor, evap core, and condenser. but that costs more money.

with a/c stuff it almost never pays to use used parts..
 

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To do it properly you would replace everything. The hoses are a must because R12 hoses won't hold 134a, the newer stuff is a smaller molecule and can leak right through the rubber that was used. The compressor really should be replaced as well, because of chemical incompatibility between the R12 and R134a oils. Don't use ester with 134a, that needs PAG.

The evap and condenser should be flushed, and the drier replaced too.
 


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