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A/C Low side valve leaks badly (replaced and still leaks)

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

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Tkollars
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A/C Low side valve leaks badly (replaced and still leaks)

Post by Tkollars » Fri Feb 26, 2016 2:46 pm

My 1998 S70 T5 low side a/c valve leaks. I have replaced the valve twice but it still leaks. I noticed it is leaking through the threads. I don't see a sealing surface on the inside of the valve port. It looks just like a bike tire and if I keep turning the valve, it will keep going. Is there a way to put another valve port on top of this one? Is there a replacement valve as in, does this whole port screw off and you can screw in another one? Maybe an adapter or an extender or something to go on top of this one? Trying to avoid changing out the whole line.
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Re: A/C Low side valve leaks badly (replaced and still leaks)

Post by phils94850 » Fri Feb 26, 2016 3:36 pm

I think all you can do is replace the inner valve otherwise youll have to replace the entire line. I would try some Teflon tape on the threads
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Re: A/C Low side valve leaks badly (replaced and still leaks)

Post by Tkollars » Sat Feb 27, 2016 2:47 am

Didn't think about tape. Might try that in the am. Will let you know. Thanks!

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Re: A/C Low side valve leaks badly (replaced and still leaks)

Post by abscate » Sat Feb 27, 2016 5:53 am

Take off the plastic cap, match threads and get an acorn nut match. Teflon tape will help seal

It sounds like the valve threads stripped. You can get a threaded that might chase the threads but that will have to thread match of course.

I might have a left over pipe that will fit if you can get part number, too.

It's tough doing these because it's 50 bucks a time for AC charge each time you try something
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Tkollars
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Re: A/C Low side valve leaks badly (replaced and still leaks)

Post by Tkollars » Fri Mar 04, 2016 7:37 pm

Ok. So here is what I did. Teflon tape would not stay and it would actually fall down into the line. Bad juju there. I ended up using blue thread locker. It sealed the threads nicely and I can still remove the valve if needed. I also put an oring on the inside of the cap to help seal it. It seems to be working.

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