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How To Tell If An AC Has Been Converted To R134a?

Look for the fittings on the compressor (or if you are lucky, in a better location). R12 fittings are threaded externally, with a small gray (usually) cap. R134a fittings are not threaded externally but look like air hose quick relaease fittings. They are threaded internally and do have a red and blue cap. Threaded internally sounds weird but the cap is a male thread and the fitting female.






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