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This article is also available in video format at the bottom of the page.Car manufacturers started using R134A refrigerant in 1995. Vehicles manufactured before this year typically used R12 refrigerant. However, many of these older systems were converted to R134A because R12 production was halted. R12 systems have threaded service ports. R134A systems can be identified by their quick-connect service port connectors, which differ in size for the low and high sides to prevent incorrect connections …