R-134a Refrigerant

R-134a Frequently Asked Questions

R-134a is one of the most commonly used refrigerants in the world. It can be found under nearly hood but there are so many questions about it that I thought I would take the time today and do a quick question and answer session for our readers. If I missed anything in here or if you would like to see anything added please do not hesitate to reach out to me and send a suggestion.

  • What Happened to R-12?
    • As you know, R-12 was the default for automotive air conditioning for decades but in the 1980s it was discovered that R-12 was harming the Ozone layer. Because of this, R-12 was phased out across the world and was replaced by R-134a.
  • What is R-134a?
    • R-134a is an HFC refrigerant that is intended to be used in automotive applications. It was designed to replace R-12. It has no Ozone Depletion Potential but has a high Global Warming Potential.
  • Can I Buy R-134a Without a EPA 609 License?
    • No, as of January 1st, 2018 you can no longer purchase cylinders of R-134a without a proper 609 Environmental Protection License. This is due to what’s called the ‘Refrigerant Sales Restriction.’ The good news here though is that without a license you are still able to purchase cans of refrigerant that contain less then two pounds of product.
  • What Kind of Certification Do I Need to Work With R-134?
    • As I mentioned above,  you will need what’s called a 609 certification. 609 comes into play when you are working on an automotive air conditioning application and ONLY when you are working on an automotive application. If you wish to work on other AC units you will need to obtain your 608 certification as well. Once you have 609 certification you can purchase, handle, and install refrigerants into automotive applications.
  • Is R-134a Toxic or Flammable?
    • No, R-134a is rated as an A1 on the ASHRAE ‘s safety rating scale. The A stands for the product not being toxic or harmful. The 1 stands for no hint of flame propagation. This is a very safe refrigerant.
  • What Kind of Oil do I Use for R-134a Systems?
    • In most cases you are going to be using what’s known as PAG Oil. PAG oil, or Polyalkylene Glycol, is a fully synthetic hygroscopic oil specifically designed for automotive air conditioner compressors. It is used in R-134a air conditioning systems to lubricate the compressor. When looking at PAG oil you will notice various numbers such as PAG46 or PAG100. These numbers refer to the viscosity of the oil, similar to 10W30 oil. In order to determine the correct PAG viscosity for your vehicle you will need to look up the specifications of your make and model of your vehicle either online or in the instruction manual.
  • Is R-134a Being Phased Out in the United States?
    • Well, at one time it was. Way back in the summer of 2015 the EPA announced that R-134a was NOT to be used in new vehicles starting with the model year 2021. Since this regulation came out though there was a court ruling that overturned the proposed rules. Since then the EPA has retracted it’s regulations and as of today there is not a set phase out date.
  • What Countries Are Using R-134a?
    • Nearly every country in the world today is using R-134a. Yes, some countries have phased it out on newer vehicles, but there are still very many cars out there that are still  using 134a. We won’t see a total vanishing of R-134a usage for at least another twenty or thirty years. Remember, we have to wait for all of these old vehicles to die.
  • Can I Mix R-134a With  R-12 or 1234yf?
    • No, it is never a good idea to mix refrigerants. Refrigerants are designed to work in specific conditions and specific pressures. Mixing refrigerants together will cause it not to change states and will prevent your system from working correctly.
  • How do I Store R-134a?
    • Storage requirements for R-410A are the same as other refrigerants. Cylinders should be stored in a clean, dry area, and out of direct sunlight. If you have cylinders in the back of your work van ensure that the temperature does not rise above one-hundred and twenty-five degrees Fahrenheit. Keep valves tightly closed and caps in place when cylinders are not in use. This will prevent any damage to your product, to your facility, or to your vehicle.
  • What Sized Containers Does R-134a Come In?
    • R-134a can come in a variety of container sizes. The most common that we see today are your one to two pound cans or your standard thirty pound light-blue cylinder.

Thanks for reading,

Alec Johnson


You may also like