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R134a is a refrigerant commonly used in automotive AC systems. It is a fluid that can easily be boiled into a vapor and condensed back into a liquid so the system can use evaporation and condensation to cool your cabin air.
R134a is a synthetic refrigerant used primarily in car air conditioning systems, household refrigerators, and commercial cooling equipment. Its chemical name is 1,1,1,2-tetrafluoroethane, and it has been the dominant automotive refrigerant since replacing the ozone-depleting R12 (commonly called Freon) in the mid-1990s. While R134a doesn’t damage the ozone layer, it is a potent greenhouse ...
Explore our homeowner’s guide to R134a refrigerant—how it works, differences with R1234yf, safe handling and why choosing the right supplier matters.