Stop in for a cup of coffee

Now the AC is blowing cold. Will let it sit overnight, and check pressures tomorrow, to make sure no leaks. Put the new custom grille in after that. Good thing I took the old one out so I could flush the condenser and change o rings...
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Dont want to come off like a know-nothing-er, but the o-rings are some kind of nitrile or something, correct? The ac from the 97 had all black o-rings buna-n i think they call them.