Before R12 was replaced with R134a in 1995, it was mostly used in trucks and cars. Next, add a can of R12a from the low side fitting while running your A/C. This means that when exposed to the environment, it exists as a gas. If you use anything other than R134a, youll likely create a situation where you must be the one servicing the system. Part # LX-14. Theyre older generation refrigerants that have some serious environmental factors against them. Attach the R134a charge port adaptors, there are two types.. one of which you need to remove the old R12 valve cores. Can you use r12 gauges for r134a? - Sage-Advices Because this recipe was quite expensive, a backlash developed which gave companies an opportunity to sell conversion kits consisting of nothing but the charging port adapters and a small bottle of oil that was somehow magically supposed to make your mineral oil R134a-compatible. 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. R1234yf is more environmentally friendly and has a global warming potential of 4. The hose length is 60 inches and comes with a 1-year warranty. Ed. Also, R134a cylinders are light-blue in color. With the knowledge of the differences, youll be able to draw a comparison between R12 vs R134a efficiency. R-12 and R-134a use different size fittings in order to avoid mixing the two types of refrigerant. Generally you follow the refrigerant flow moving from connection to connection, component to component, and you sniff the a/c vents to check for evaporator leaks as well. R12 was the first refrigerant created. Its not that difficult but the procedures of evacuation, charging and testing should be done by a licensed a/c technician that is experienced with R134a and your particular car. Just leave it alone for now. As you probably know, matter can exist in three statessolid, liquid, and gas. I am currently retired and no longer do much with HVAC, however, I feel like I have a lot of knowledge in the subject and I wanted to create a website where I could talk about what I've learned and help upcoming HVAC techs. The cylinder head gasket is one of the most over-engineered and stressed components in an internal combustion engine. Both of these refrigerants wont be used in new air conditioning or refrigeration plants, but theyll continue to be used in existing plants and the automotive industry. That doesnt mean to say that theyre no longer used. While R513A is a viable option for new and existing equipment, it is not a "drop- in" replacement for R12 or R134a. As Ive said, R12 is a nasty ozone-destroying chemical and should never be released to the environment under any circumstances, so in addition to being illegal to vent it, you have a moral obligation not to vent it. Failure to abide by the EPA regulations can result in expensive fines for either you or your service technician. If your car does not have a high pressure cut-out switch in the AC system then youll need to have one installed (call us if you need help). Many older automotive systems still use R12, and as youre still able to purchase individual small cans of this refrigerant via on-line marketplaces, its use in many classic motor vehicles will likely continue. The simple answer is you cant. All compressors require oils to lubricate the moving parts. The R12a cans use the same taps as the R134a cans and the supplied hose has R134a compatible fittings on both ends, so R12a can be used to recharge R134a systems too. These two refrigerants are very similar. The compressors used by refrigeration plants to compress gas require oil to help lubricate its moving parts. Even though their common major function is to cool the system, they have many differences. Well worth the money if your A/C system is still in good shape. Remove the old mineral oil from the compressor by turning it upside down, side to side, and turn the front hub on the clutch assembly. Note also that, unlike mineral oil, both PAG oil and ester oil are hygroscopicthat is, they absorb water. A set of R134a-specific charging port adapters should be installed to eliminate the possibility of refrigerant cross-contamination. R-12 isn't just unfriendly to the ozone layer, it has a GWP value of 10,900! If you still find it difficult to use R134a in a home AC system, you can check out a comparison of R12 vs R134a fittings to know the refrigerant that best fits the AC system. So as long as the system was functioning correctly and not leaking, it appeared that you could flush the system of any old oil, change the oil in the compressor to PAG or ester oil, replace only the receiver-drier and the o-rings, screw on the charging port adapters, evacuate the system, and recharge it with the new R134a, using about 80% as much as the original R12 volume. R12 has a GWP of 10,910, so its effect on global warming is over 10,000 times greater than carbon dioxide. See your PT chart. Thus, R-600a is more efficient than R-134a. This makes it expensive to purchase and adds to the attraction of replacing it with other greener products. For example, if your system originally had 36 ounces of R12 then you multiply that by .80 and you have 29 ounce of R134a. This is a highly desirable property as it means that the boiling point is always below the targeted temperature.
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