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. Sign up for the latest automotive news and videos—in short, everything for people who love carsWe’ve been talking about air conditioning for a couple of weeks now, so if you’re still feeling the heat then it’s time to wrap up the series so you can get out to your garage and put what you’ve learned to good use.First things first. It is important that there is not an in your car's air conditioner system, in order to maintain cool air temperatures in the vehicle's cabin when the air conditioner is on.There are different types of A/C Freon. Some sites say that R12 was used in residential HVAC systems prior to the introduction of R22, while others state that R12 was used exclusively for automotive HVAC systems. With new R12 no longer being manufactured, the market price soared to $100/pound. But in order for refrigeration to work, you need something that has a low boiling point, something that exists as a gas at room temperature and can be easily pressurized into a liquid so that, when it is allowed to expand, it immediately boils at room temperature and cools.In addition to the low boiling point, there are two other de facto requirements for refrigerant: It shouldn’t be poisonous, and it shouldn’t be flammable. Note that I am not advocating taking the exam and getting the EPA 609 certification simply so you can legally buy R12; I’m just stating what the law appears to be.

If you experience car A/C problems, Firestone offers quality car A/C repair services from experienced, ASE-certified automotive professionals. Let's drive together. The advantage of ester oil is that it works with both R12 as well as R134a, so you can fill the system with it and then use either refrigerant.Note also that, unlike mineral oil, both PAG oil and ester oil are hygroscopic—that is, they absorb water. Also, the EPA 609 certification can be easily obtained by taking an online exam. Originally, R-12 Freon was used in car air conditioners. There are other EPA-approved refrigerants such as “Hot Shot” and “Freeze 12,” which you can findLastly, there are the flammable organic refrigerants (propane and its blends). International manufacturing of new R12 ceased in 1996, but existing R12 can still be reclaimed and purified. So when someone says, “You can’t get R12 anymore,” or “It’s illegal to use R12,” those things simply aren’t true. Freon is a refrigerant that cycles through liquid and gas phases, and works to regulate the temperature of your car. R134a reacts with water to form hydrofluoric acid which damages the internal A/C components. Browse. Which is it? See the basics of how a car A/C functions. ... Commercial use license images. If you use anything other than R134a, you’ll likely create a situation where you must be the one servicing the system. With R134a you do not rely on the site glass. 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. Upload from your computer. … But if you live in a hot climate, want to daily-drive the car, and the car has a tiny-capacity A/C system which, even after modernization, may only perform marginally, you may want to consider sticking with R12. As long as the compressor was working well, it could be drained, filled with R134a-compatible oil, and reused. The problem was that there was not agreement on exactly what was required for the conversion. To be absolutely clear, these refrigerants are With that said, I’ll agree that the flammability issue may not be as black-and-white as it appears. For example, while R12 itself is similar to the halon used in fire extinguishers, when R12 is mixed with mineral oil—the most commonly-used lubricant oil in R12 systems—and aerosolized and burned, it creates phosgene gas, which was used as a chemical agent in WWI.You can recharge your A/C system with chicken soup (lousy refrigerant, by the way) and no black helicopters will come to your house, but in a world where people usually don’t hold onto their cars forever, R134a is still the best choice for retrofit applications.

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