I have a 2000 Honda Civic which I can't seem to get the high side charging port to stop leaking. I can see small bubbles when looking down at the Schrader valve.

Sometimes it takes a few months to leak down enough to need a recharge. I have replaced the Schrader valves two or three times. I think once I used oem Honda. The others were from Oreilly's.

Does anyone know of a brass charging port cover for auto a/c applications? The plastic ones seem to just be dust covers. I have seen them for building a/c systems but none threaded to fit auto systems.

Am I missing something obvious? I have replaced these on other vehicles with no problem. I don't really want to replace the hard lines with the ports in them if there is another solution.

The caps actually help seal the valves. If you've already changed the Schraeder valves then they shouldn't leak. Ive always used the plastic caps and they worked fine, if they are leaking then it's got to be bad valves. I know you've done them already but they shouldn't leak being brand new.

I think home A/C caps have fine threads while the dust cover caps have coarse threads.

I would take one of the caps to a local A/C place and see if they can help you. They could measure the thread size. You may also check Lowes in the bolts section for their thread size jigs and then go to the plumbing section once you know the size and see if they have any of the fittings.

Try tightening the shrader valve (the little actual valve in the middle of the shrader valve can be tightened and automotive places sell the tool for a few bucks.....

So did you put a vacuum on the system before refilling with Freon?
There could be dirt or damage to the Shrader valve seat that is causing the leak.

I retightened the Schrader valves. The high side moved almost another quarter turn. After
I recharged there were no bubbles in the charging port.

Hopefully that will do it. Thanks for the replies.