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Schrader Valve leaking - need advice

cozment on Fri August 22, 2008 10:17 AM User is offlineView users profile

Year: 2000
Make: Nissan
Model: Frontier
Engine Size: 3.3L
Country of Origin: United States

I've got a Schrader valve leaking on the low side of my air conditioner system where I put the Freon in. I noticed it was leaking because after recharging my system, I can see the dye bubbling around the valve. I actually replaced the schrader valve but it gives me the same results. By morning, the Freon has leaked out enough to not cool well. I was told by my mechanic that I probably need to replace the low side AC hose so this whole assembly would be replaced along with a new schrader valve. I'm just confused on why this would be the case since the valve itself is leaking. Does this assembly go bad? The rest of this hose seems to be fine but it is 8 years old.

mk378 on Fri August 22, 2008 10:30 AM User is offline

This is normal, it may not even be a real leak just refrigerant bubbling out of the oil due to sudden reduction in pressure. It should quit leaking when you put the plastic cap on. Make sure you have a good rubber gasket in the cap. Then check for leaks with soapy water on the port/cap assembly. One that lets it all leak out in 24 hours will be real obvious. I suspect though that you have a leak somewhere else in the system.

cozment on Fri August 22, 2008 10:40 AM User is offlineView users profile

I had actually lost my cap to cover the valve but got some new ones in the same package as the new schreder valve. It definitely doesn't look as beefy as my factory ones. But from what I have read on this forum, even though I might have a valve leak, if you have a good cap to cover it, that should prevent further leaking?

Let's say that the valve is my culpret and a new one doesn't resolve my issue. Would you agree with my mechanic that the whole low side hose assembly needs to be replaced to resolve this? Does this have to come straight from the dealer or can you get it aftermarket?

GM Tech on Fri August 22, 2008 10:45 AM User is offline

With dye already in the system- look elsewhere for your massive leak- I suspect compressor body or shaft seal as well-- a good sniffer along with a good mechanic will find it quick..

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

cozment on Fri August 22, 2008 10:56 AM User is offlineView users profile

One important note that I left off was I did just replace my compressor, dryer, and expansion valve along with all of the O rings. I had a leak before I replaced everything but the main reason for replacing was the compressor was making an awful noise and wasn't cooling well.

cozment on Fri August 22, 2008 10:58 AM User is offlineView users profile

The leak also seems to be associated with temps as well. We had a cool spell where the temps got in the low 60's and that's when I noticed the AC system was not cooling as expected. During the hot summer months, everything seems to work fine with no leaks.

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