They may sound just like similar part numbers, but there are major differences between them. Because A/C compressors have moving parts, they require oil. I think that, with hindsight, many people would agree that, even given that R12 is an ozone-destroying agent, fines of this level made many hard-working A/C technicians hostile to the government, and thus were counterproductive.R12 and R134a are not the only game in town. And with R134a costing only two bucks a can, converting to the new inexpensive refrigerant seemed the thing to do. Condensers designed to release greater amounts of heat help to expel the greater amount of heat which R134a removes from the car’s interior. Connect hoses to their respective side ports. But many European cars, such as the vintage BMWs I love, had A/C systems that never functioned all that well even when they were new and charged up with R12. Unlike R-134a, the new R-1234yf is extremely flammable with a flammability rating of F+. The question instead is: Why is the system dead? R12 and 134a are refrigerants used in car air conditioning systems. It cannot be poisonous or inflammable.In the early 1900s, a new refrigerant came into the market, which was based on chlorofluorocarbons (CFCs), mainly dichlorodifluoromethane. Just leave it alone for now.Pound for pound R134a is a more efficient refrigerant than R12, however it runs at higher pressures in some aspects and therefore requires more effective condensing. By international agreement in 1987 (the Montreal Protocol), the use and production of CFCs such as R12 began to be phased out, with automobile manufacturers required to stop using it by the end of the 1994 model year.

Put the thermometer at the center to measure the temperature so that you can add or remove R134a.Connect the T valve to the lower side port and open it.

Refrigerant R-134a, also known HFC-134a, is a hydrofluorocarbon (HFC) refrigerant. It is bad both for the environment and for the performance of your A/C. A set of R134a-specific charging port adapters should be installed to eliminate the possibility of refrigerant cross-contamination.

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Early domestic air conditioners... R22 Is an HCFC, While R134a Is an HFC. If you use anything other than R134a, you’ll likely create a situation where you must be the one servicing the system. Start the vacuum pump and open both high and low valves on the manifold gauge. Your decision could be made based on economics, environmental concerns, or both.

Very few DIY-ers have recovery equipment (I don’t), so you need to take the car to a shop that does, and fewer and fewer shops keep and maintain R12-recovery equipment. It can even result in a leak in the long haul.If your car is consisting of the hold Harrison DA6 compressor, you should replace it with HR-6, HE-6, or HR6-HE.

Whether R134a performs as well as R12 in any given a/c system depends upon system components and the amount of R134a used.Given two identical vehicles, each with the same weighted amount of refrigerant, the vehicle with the R134a has the “capability” to remove more heat (measured in btu’s) from the vehicle than the same type of vehicle using the same amount of R12.The most common influences which effect the capability of R134a to perform well are the condenser, in some cases the the superheat setting of the expansion valve or the amount of R134a. So, along with R134a came a new oil: Polyalkylene Glycol—or PAG oil.Note that there is another kind of oil called Polyol Ester Oil (POE). Allow the refrigerator to drain for five minutes and check the inside air temperature. Push the new R134a fitting over the old fitting. 1234yf was the automotive refrigerant of the future. It has unusually high potential to cause the depletion of the ozone layer in the upper layers of the atmosphere that causes the greenhouse effect. (To be clear, both cars also have a new rotary-style compressor and a big parallel-flow condenser and fan. The choice was made because of R-134a (cost, ease of access, etc.). There are some other very important differences between the two refrigerants.

R12 was well-known for its good working capacity and eco-friendliness.However, later in that century, it was found out that there was a hidden danger posed by this refrigerant.

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