A/C leak I cannot find

2002 CHEVROLET TRAILBLAZER
150,000 MILES • 4.2L • 6 CYL • 4WD • AUTOMATIC
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KEITH SIZEMORE
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Hello, when I recharge my A/C I don’t lose pressure. I actually gain pressure until the compressor shuts its self-off. I’ve used UV dye can’t find anything. I’ve used an air compressor and soap and can’t find anything. But when I use the vacuum pump to pull all the air out of the system the needle climbs immediately after I turn off the pump, so I know there is air getting in some way. Please help.
Jul 6, 2022 at 5:11 PM
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STRAILER
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Yes, you have a leak, typically when you can't find it will be leaking from one of three places, the compressor seal near the clutch, the evaporator or condenser core, I visual or leak detector can help with finding the problem, when using a leak detector there can be no wind or breeze whatsoever. Also, when using the leak detector check at the bottom of the compressor clutch, refrigerant will sink because it is heavier than air. This guide and video will help:

https://www.2carpros.com/articles/air-conditioner-leak-detection

and

https://youtu.be/yrhWKlQEPWw

Let us know what happens and please upload pictures or videos of the problem.
Jul 7, 2022 at 11:46 AM
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KEITH SIZEMORE
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Hello, thank you for the response. I’ve already changed the evap, so I know it’s not that. So, you’re saying I should get an electronic detector and go that route? I’ve used the UV to try to find the leak I found nothing. Just wondering if there is a leak wouldn’t the tv dye leak out and show under light or no?
Jul 7, 2022 at 3:45 PM
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KEITH SIZEMORE
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Condenser looks good to go no bends or wear and tear and no up around condenser.
Jul 7, 2022 at 3:46 PM
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KEITH SIZEMORE
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.
Jul 7, 2022 at 5:31 PM
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KEITH SIZEMORE
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Found the leak replaced orifice no loss of suction in the lines. Recharged the system, it was blowing cold but still gaining pressure, the switch kicked and turned compressor off. I would imagine there is a blockage somewhere after seeing the orifice tube. any idea what to do next?
Jul 8, 2022 at 11:32 AM
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STRAILER
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Yep, with the orifice looking like that the compressor is coming apart and spreading the seal material throughout the system. You can get a couple of cans of A/C system flush and a new compressor.

https://www.2carpros.com/articles/replace-air-conditioner-compressor

and

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

Check out the diagrams (below). Please let us know what happens.
Jul 9, 2022 at 11:48 AM