Automotive A/C question


Old 02-19-19, 02:26 PM
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Automotive A/C question

Hi All and thank you! I am revamping an old 1974 car's A/C system and will be using flare fittings at the two evaporator connections. I am confused as to whether I am supposed to use a copper washer in each. All fittings are new except the evaporator female fitting for the compressor hose and it looks to be in good shape in terms of its threads and surface. Many thanks!
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Old 02-19-19, 04:02 PM
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Welcome to the forums.

Flair fittings don't usually use any type of gasket.
The flare of the pipe contacts the fitting tightly and that's the seal.
Old 03-08-19, 12:00 PM
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I think you are ok to just use a bit of special ac sealer on the threads, and it should be fine. The copper washer in conical form are typically used to repair a fitting that is leaking. I am not 100% sure for your specific application, so hopefully you will get further feedback. In any event, the Nylog is good stuff to use on home or auto ac.
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