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Pressure test OK but not with compressor running

RobbieP on Sun April 29, 2012 7:02 PM User is offline

Have you ever had a situation where you pressure test a car a/c system with Nitrogen to 120psi and it holds. Then after you vacuum it and charge with r-134a, it leaks and won't get anywhere near the 120 psi you were able to pressure test it at?

When the proper amount of r-134a is added, it will only go up to about 50-60 psi on high and low side after the pressure equalizes and will hold there?

What could this be a sign of?

Thanks.

TRB on Sun April 29, 2012 7:47 PM User is offlineView users profile

Could be a shaft seal leaking. Put a shower cap over the clutch and let it sit. Then use an electric leak detector to see if you have a leak.

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mk378 on Sun April 29, 2012 9:32 PM User is offline

Are you using a full charge by weight? You never get 120 psi static pressure (unless it is very hot) because the R-134a changes to liquid at a lower pressure than that.

RobbieP on Sun April 29, 2012 9:45 PM User is offline

Quote
Are you using a full charge by weight? You never get 120 psi static pressure (unless it is very hot) because the R-134a changes to liquid at a lower pressure than that.

Yes, charging by full weight.

The highest the high side gets is 50-60psi. It's gotta be leaking somewhere but I just can't find it anywhere else and I am wondering if it leaking from the compressor. Through the shaft could be it. I have to test for that.

I just can't understand why as a test without anything running, I can get it to keep 120psi with nitrogen. But once it is charged and is running, it won't go that high.

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