billyed Posted November 3, 2021 Report Share Posted November 3, 2021 HELP! - My 40 foot diesel pusher dash AC is discharged again. I had it charged in June because it was discharged then as it was about 8 months previous to that. I have had a local RV dealer look at the system as well as an automotive AC soecialist shop and neith can find a leak in the system but it just will not retain a charge for even a full year. Any ideas? Quote Link to comment Share on other sites More sharing options...
Darryl&Rita Posted November 3, 2021 Report Share Posted November 3, 2021 Time to get some dye into the system. Get a better AC repair shop. They'll add dye, run the system, then use a UV lamp to narrow down the leaks. Quote I have been wrong before, I'll probably be wrong again. 2000 Kenworth T 2000 w/N-14 and 10 speed Gen1 Autoshift, deck built by Star Fabrication 2006 smart fourtwo cdi cabriolet 2007 32.5' Fleetwood QuantumPlease e-mail us here. Link to comment Share on other sites More sharing options...
Ray,IN Posted November 4, 2021 Report Share Posted November 4, 2021 Did those shops test both refrigerant lines from the compressor and back? That's over 80' of flexible lines. Quote 2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG retired;Good Sam Life member,FMCA ." And so, my fellow Americans: ask not what your country can do for you--ask what you can do for your country. John F. Kennedy 20 Jan 1961 Link to comment Share on other sites More sharing options...
billyed Posted November 4, 2021 Author Report Share Posted November 4, 2021 The AC shop installed dye and tested all fittings at either end but nothing in the center as the lines are hidden within the underfloor covering but I am working on the assumption that as they appear to be hard lines with flexible ends, there should not be any leaks in the center sections. To get at the center section of the lines is going to be major disassembly. It has been suggested that this might be an internal leak within the compressor but I would have thought that would still show up on the dye leak test. Any other ideas? Quote Link to comment Share on other sites More sharing options...
Ray,IN Posted November 5, 2021 Report Share Posted November 5, 2021 Those long lines are some what flexible but yes, hard on the outside. To leak-test them requires disconnecting both ends and pulling a vacuum, then allowing to sit undisturbed for a day, or until the vacuum lessens, whichever is less. Quote 2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG retired;Good Sam Life member,FMCA ." And so, my fellow Americans: ask not what your country can do for you--ask what you can do for your country. John F. Kennedy 20 Jan 1961 Link to comment Share on other sites More sharing options...
Domo Posted May 6, 2022 Report Share Posted May 6, 2022 (edited) Hmm, I wonder if a shop could disconnect both ends of the lines, cap one end of each and pressurize both lines. Let it sit for a day and then read the pressure to prove or disprove a line is leaking. Seems that might narrow your quest down... If you found a line was leaking you could simply abandon that line and run a new one rather than dig for access to the culprit (maybe abandon both lines is one was proved to be leaking). Edited May 6, 2022 by Domo Quote 2008 36 QSH2017 Jeep Cherokee TrailHawkBlueOx towbar and baseplatesRoadmaster Brakemaster Remember, there is a real person on the other side of your screen... Link to comment Share on other sites More sharing options...
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