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Until 1995, most cars with air conditioning used R-12 Freon refrigerant that is said to have a negative side effect of damaging the ozone layer and is no longer produced in most countries. Now, the industry standard is R-134a, which is an efficient absorber and carrier of heat without the ozone layer-damaging issues of R-12. Contrary to popular belief, most cars originally equipped with R-12 can be converted to 134a and still keep you just as cool. Click Here For This Month’s Tech Article You Will Need Adobe Acrobat Reader to View this PDF Courtesy of Classic Auto Air • Classicautoair.com