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High side port hissing

Spikepaga on Thu October 16, 2014 12:52 AM User is offlineView users profile

Year: 95
Make: Jaguar
Model: XJS
Engine Size: AJ16
Refrigerant Type: r134
Country of Origin: United States

i noticed today that if I take the cap of my high side port, I can hear a hissing. No liquid freon comes out, but it hisses. If I replace the cap it stops. Will I loose all my freon? Do I need to get it taken care of right away?

wptski on Thu October 16, 2014 8:34 AM User is offline

You should as the charge "may" all leak out slowly. There is a device that can be used to replace the Schrader valve core without losing/removing the charge. Some kits are sold for both high and low side but some are just one or the other.

Edited: Thu October 16, 2014 at 8:34 AM by wptski

Cussboy on Thu October 16, 2014 9:15 AM User is offline

Just use a good cap, there's a sealing washer inside them. Many of these valves do leak. But you won't lose any freon - your 1995 doesn't contain any.

mk378 on Thu October 16, 2014 12:04 PM User is offline

If it's the ball valve type used on many Ford and GM you would unscrew the whole port from the line to replace it as a unit. System must be empty to do that.

Generally the cap will keep the refrigerant in. At least it is supposed to. All port valves "normally" leak to some degree with the cap off.

Spikepaga on Fri October 17, 2014 9:25 AM User is offlineView users profile

Thanks very much for you replies.

Well the hissing stopped when I removed the cap, so it looks like the ball reseated itself-somewhat-now if I remove the cap I'll see a little refrigerant gurgling out for a few seconds and then stop, with the cap on it seems no refrigerant is actually leaking. (There is dye in the system and I can't detect any coming out when the cap is on).

Either I will replace the ball valves, which I noticed both the high and low side ports have.

Cussboy on Fri October 17, 2014 9:36 AM User is offline

"Never trouble trouble until trouble troubles you !!!"

Spikepaga on Tue October 21, 2014 6:10 AM User is offlineView users profile

Thanks for the replies.

Well, I bought a drier since the system was going to have to be evacuated for the port and headed to the A/c shop. Once there, the owner sprayed some soapy water on the ports twice and said they where not leaking. He said the refrigersnt leak sensir would be pointless on ball valves because "they all leak" is this accurate ? Are the caps part of the seal on these ball valve ports? me it even seems like it may be the over tightening of the caps that causes the ball valves to leak. ...any recommendation on the best caps for ball valves??


mk378 on Tue October 21, 2014 11:47 AM User is offline

Yes the cap is supposed to contain any refrigerant that leaks past the ball. Make sure the rubber seal in the cap is good and don't overtighten it. Probably the best way to get a good matching new cap is to buy a new port and take the cap off.

Edited: Tue October 21, 2014 at 11:49 AM by mk378

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