dan turpin Posted June 7, 2022 Share Posted June 7, 2022 Having a issue on 2019 freightliner ad9si air dryer keeps purging ,changed all lines (charge line,supply line and signal line)installed ball shut off valve in line with gauge on either side on signal line and when dryer builds to cut off and purges close ball valve and the dryer looses its air in the line ,not always though but alot of times been chasing this problem for weeks,have installed 3 dryers now any help would be appreciated Quote Link to comment Share on other sites More sharing options...
EdsTowing Posted June 8, 2022 Share Posted June 8, 2022 Did you replace the air governor? It unloads the compressor and purges the dryer, maybe that purge line is staying charged? Quote Link to comment Share on other sites More sharing options...
dan turpin Posted June 8, 2022 Author Share Posted June 8, 2022 ad9si dryer governor is internal Quote Link to comment Share on other sites More sharing options...
EdsTowing Posted June 9, 2022 Share Posted June 9, 2022 Over the years I have had a couple times where I had a problem with a Bendix system and their tech support helped substantially. They were called the "Bendix Answer Man"... Looks like they changed the title but they still offer the service. https://b2bendix.com/MX/en/MXN/TechTeam I would try it. Quote Link to comment Share on other sites More sharing options...
EdsTowing Posted June 9, 2022 Share Posted June 9, 2022 Found this from Bendix, it may help... https://www.manualsdir.com/manuals/583528/bendix-commercial-vehicle-systems-ad-9si-oil-coalescing-air-dryer.html?page=13 1 Quote Link to comment Share on other sites More sharing options...
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