A/C R12-to-R12a Refrigerant Recharge Results - Forums Hopefully Ive properly conveyed that, if the A/C in your precious vintage car is long-dead, the question isnt whether you choose between buying a few NOS cans of R12 and shooting them in (seriously dont do that) or converting to R134a. If your vehicle is after 1994, you could use R-134a in its air conditioning system. Using R134a requires that Polyolester (POE) lubricant must be used in the compressor. If you find any of these conditions you will want to liquid flush (with dedicated AC flush solution) all the lines, condensers, evaporator (remove the expansion valve) before you proceed further. This chemical has carbon, hydrogen, and fluorine. The alternator, sometimes called a generator, generates electricity to charge the battery and power all the electric auxiliaries while driving. R12 is used in several applications like low temperature, medium temperature, and high-temperature applications. Rob Siegel has been writing the column The Hack Mechanic for BMW CCA Roundel magazine for 30 years. There is R744, which is literally carbon dioxide (CO2). So if you car has a large amount of rubber hose, such as a 40 feet with the 911, then you will be re-charging the system often and that is expensive no matter which refrigerant you use. The reason is that the vehicles, for instance, manufactured currently configure the engine for R1234yf refrigerant, making no provision for replacement. This means that this compound is made up of carbon, chlorine, and fluorine. When the temperature is reduced to-7C or below, the plants ability to cool the airdrops significantly. This means that the mineral oil in the system wont dissolve. Hence, the effect of R12 on global warming is up to 10,000 times higher than carbon dioxide. R12 systems use screw-on connectors, while R134a systems use push-on connectors similar to those used in air tools. h. c. F. Porsche AG. Their differences come mainly in their chemical make-up and environmental impact. Legally. R12 has not be manufactured for a long time it was outlawed in the US. R12 and R134a are older types of refrigerants that are considered to be dangerous to the environment today. Its often said that buying or selling R12 is illegal. These applications will - due to browser restrictions - send data between your browser and our server. This makes it expensive to purchase and adds to the attraction of replacing it with other greener products. Yes R12 systems did cool better than R134a, but there are differences and it is not wise to go back wards. Unfortunately, the widespread use of R12 appeared to be significantly degrading the Earths ozone layer, potentially causing a worldwide health crisis. Refrigerant 134a, or R134a, was developed as an alternative to the CFC refrigerants known to cause environmental damage. You confirmed my decisions in one elegant post (as opposed to the 60-odd hours of blog post readings and YouTube videos). Thus you see how R134a conversion was often applied to systems that were not working correctly, if they were working at all. However, you will need different recovery machines and other equipment to handle R1234yf. The higher the ambient temperature the higher the high side pressure. Santech R12 to R134a Coupler . After the optimum refrigerant charge is determined the car should be test driven to check for performance of the system. And then there is the very interesting refrigerant R152a, which is the ingredient in keyboard duster, minus the bittering agent added to prevent inhalant abuse. With a tight modernized system thatll accept either refrigerant, you should then consider where and how the system will be operated. Because R-12 is no longer manufactured and has not been used in cars for over 20 years, this article will focus on systems designed for R-134a. Theyre also tasteless, colorless, and odorless. My name is Bob Wells and I am a retired HVAC tech from Washington state. These properties make it very attractive for domestic, commercial, and automotive refrigeration and air conditioning. We chose to use 5-6 ounces of oil to be on the safe side: 3-4 ounces for the compressor, 1 oz of oil for the drier and another ounce of oil for system losses. There are other refrigerants: some of which may work, some of which dont work, some of which will destroy your a/c system and some of which are dangerous. Converting them is extremely expensive, and in many cases, replacement is the only option available. No, its not possible to mix these two refrigerants. R134a was developed to replace R12, so it works over the same range of applications. I have seen a large difference in pressures you are looking for due to temperature demand of unit. A set of R134a-specific charging port adapters should be installed to eliminate the possibility of refrigerant cross-contamination. Before R12 was replaced with R134a in 1995, it was mostly used in trucks and cars. And that brings us to, I continue to use R12 in two of my carsmy 1972 BMW 2002tii and 1973 Bavaria. Before landing on the debate of R134 vs R12 you should know that both R134a and R12 are AC refrigerants types used in refrigeration and air conditioning systems. R134a is safe to use as its not toxic, flammable, or explosive. Any old black o-rings should be replaced with R134a-compliant green o-rings. Bottom line, R134a simply doesn't cool as well as R12. However, if it is taken close to a fire flame or any electrical heating element, it disintegrates into toxic products. Being a CFC, this product depletes the earths ozone layer, contributing to global warming. So, along with R134a came a new oil: Polyalkylene Glycolor PAG oil. This item: R12 R22 R134a R404a Manifold Gauge Set 3" Gauge HVAC A/C Refrigeration Charging Service. Its found in domestic and commercial refrigeration and air conditioning. This product is non-toxic, non-flammable, and not explosive, so its extremely safe to use for domestic refrigeration. Whether R134a performs as well as R12 in any given a/c system depends upon system components and the . As these two products essentially do the same job, there are many similarities between the two refrigerants. Certainly no one selling cans of R12 on Craigslist is asking for your EPA 609 card. R134a is an HFC or tetrafluoroethane, and its chemical formula is CH2FCF3. That makes it safe in terms of safety to use.
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