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Inasmuch as R134a has a global warming potential thats over 1000 times more threatening than carbon dioxide, its better than R12. Can I just use an adapter and save $200? They would then make short "jumper hoses" to connect to the existing stock hoses, refit your old fan if there is a "pusher" fan, and recharge to specs. You do not want to exceed the systems high side recommendations. Skin contact: If the R134a (liquid) comes in contact with your skin, it could cause a burn. $21 . Mine was 61, so the system is not working as it is supposed to. Some compressor manufacturers or OEMs suggest PAG type oil for R134a. leading to corrosion of expansion valves, capillary tube plugging, and compressor bearing . Instead, top off R12 with R134a refrigerant. They plug all the time. These two refrigerants are the older types and are not used in newer refrigeration and air conditioning systems. If you you dont have the free time to play then you are better off to pay a technician. (The .133 is the 300D Turbo).So, what does your compressor look like?B. I found that in the..Maxposition on the control it will have the compressor running all the time. Expansion Valves Catalog E-1, July 2012. Miscibility with oil: R12 can be mixed with the compressor oil no matter the operating condition. Catalog E-1, Thermostatic & Automatic Expansion Valves / Page 1 Table of Contents . How is 1234yf different from . Refrigerators generally utilize R22, R32, or 410A-based coolants as their cooling agent. CONCLUSIONS The differences in the theoretical C.O.P.H calculated for R12 and R134a are consistent with values quoted in the literature. I put in a new (not reman) compressor (R4 I believe it is) in my merc 240D, new drier, new expansion valve, new o-rings, nylog. They should be able to keep you comfortable on a long trip, but don't expect vent frost in 3 minutes or lesss.2) Too much oil can reduce cooling capacity, and the effect is not linear. might be due to charge or different compressor and age. What was the ambient when you took that reading?Jumpering the aux fan is a common thing here in the desert. 37 in 2005 tacoma, R134A. This would become an expensive investment for a repair or service station to have unique dedicated equipment for every type of alternative refrigerant. The cure is to use the newer R134a compressors is sealing washers that are different thickness. It won't be optimal, though. I mean, really a lot. Electric fans do wear out. A vacuum pump, a refrigerant recover system, quality service gauge set with both low and high side gagues, and much more besides the lessons to learn what to do and what not to do. And yes - expansion valves sometimes need replacing if they are sticky - but a proper AC flush should eliminate the need for a new one if it's already in good condition. If you're getting a R134a compressor, might as well finish the job - replace the receiver/dryer, flush everything else, and convert to R134a anyhow. We suggest dumping the old refrigerant oil in a clean container and inspect the oil for sludge or waxing (old oil that has gelled) and contamination (metal particles).