Im chasing down a small leak that developed while changing out my evap core. It wont hold vacuum for more than a few hours.

I have put a small charge of freon, and pressurized the rest with nitrogen. I am aware that static pressure is about 80 psi, but was wondering if I could pressure test at 150? 200? Whats the max?

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Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2

You can pressure check with as much pres you can get from your nitrogen bottle. Do you have a sniffer?

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

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The nitrogen bottle is over 1,000 psi. I went with 100 so that I could get a read on both gauges. I'll report back in a few hours to see if it holds or not.

The sniffer I bought from fleabay. It does not really work as well as I hoped. Any good leads on a decent sniffer? Maybe one with a fan?

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Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2

Article here discusses using nitrogen @ 200 psi with an small R-22 charge.

Trouble finding A/C leaks? (especially with 134a)

I've seen R-22 mentioned on the forum here also, as an aid to locating leaks, not as a refrigerant.

Is the 1,000 PSI the maximum scale on the gauge?

I was under the impression that at room temperature, nitrogen was at about 250PSI. Whatever it is, you can pressurize the a/c system with 200PSI after putting in 2oz. of R22 and your sniffer will detect leaks really well, even on the low side.

Hope this helps.

__________________
2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

Annoy a Liberal, Read the Constitution

If you do find any leakage around O ring joints or at the sensor terminals likely a worn compressor seal .
Now the best way to check for seal leakage?

Ad

What seal are you asking about, the shaft seal?

__________________
2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

Annoy a Liberal, Read the Constitution