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R134 service port leaks
Posted: Mon May 09, 2016 8:49 pm
by kreim
A 94 Honda and an 03 Vibe both have leaking Schrader valves, replacing schraders with new A/C valves did not help, had to tighten down caps to stop leaks. Both cars had new lines installed and the valves leaked on them also. Now it seems one discussion says the cap is the primary seal , news to me. Like to here some comment on the subject.
Re: R134 service port leaks
Posted: Mon May 09, 2016 9:05 pm
by Jag987
yup, a little leak is normal. I try to tighten them if they are leaking a little. If I pull my coupler off and they are spraying, I put the cap on long enough to pull out the tools to replace them. I bought a kit to replace them without evacuating the system so it is not a very big deal at all to replace one. They all leak some, and yes the cap is the primary seal. Make sure the cap has a rubber seal in it.
Re: R134 service port leaks
Posted: Sat Jun 11, 2016 9:53 am
by Dave in Texas
"I bought a kit to replace them without evacuating the system"
really? How does that work and where to find? I've got one leaking on the High side. Cap keeps it in check, but I'd like to replace it so I can use my gauge. Thanks
Re: R134 service port leaks
Posted: Sat Jun 11, 2016 11:31 am
by Tim
Dave in Texas wrote:"I bought a kit to replace them without evacuating the system"
really? How does that work and where to find? I've got one leaking on the High side. Cap keeps it in check, but I'd like to replace it so I can use my gauge. Thanks
http://www.ackits.com/mastercool-servic ... ver--24673
Re: R134 service port leaks
Posted: Sun Jun 12, 2016 7:01 am
by Dave in Texas
Thanks Tim for the info.
Sometime soon I'll be changing the compressor/etc. on my Deville due to front seal leak. When I get around to dealing with that project, I'll replace the valves with new ones rated for AC. (new compressor installed in '96) Car not a daily driver is main reason for service length.
Re: R134 service port leaks
Posted: Sun Jun 12, 2016 11:53 am
by Cusser
Jag987 wrote:yup, a little leak is normal. I try to tighten them if they are leaking a little.... They all leak some, and yes the cap is the primary seal. Make sure the cap has a rubber seal in it.
Good caps are important part of the system.
Re: R134 service port leaks
Posted: Mon Jun 13, 2016 10:05 am
by ice-n-tropics
1) New charging valves typically have a light oil film which aids in sealing. When servicing any elastomer in a A/C system, best practice is to apply lube
2) Refrigerant flow through the charging valve washes off all oil from the sealing surfaces
3) OEM charging is into the high side charging valve only
4) OEMs rely on the tight charging valve cap to seal refrigerant especially on the high side, therefore just get use to it
hotrodac