Will be resurrecting my a/c soon and do have a question. Are the "O" rings sufficient for the connections or do the threaded connectors need any type of sealant (liquid or tape)?
O-rings should be lubed with clean refrigerant oil. A drop of that same oil on the fitting threads won't hurt. As for sealant, no, no, no. The o-ring is the seal. Period. And don't go nuts with tightening just because you're using big wrenches!
Drives me nuts when I work on a car and find teflon tape or pipe thread sealant on a flare fitting! Clearly the person doing this does not understand where the sealing surface is. Hint: it's not the threads!
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