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Dryer hiss


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01 CX when air pressure drops to cut in level air starts hissing from dryer for sometimes 2 minutes or more then stops and pressure builds as normal. During this the pressure holds constant but noticed if I'm building a lot of boost during this time hissing gets much louder. Just wandering which end to look at first compressor govner or dryer.

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  • 1 month later...

I have had similar problems. It never really gave any problems but I replaced the governor because it's the cheapest place to start. Still did it so I took my ad-4 air dryer off and replaced it with an ad-9 dryer and it stopped it. It could also be as simple as the relief valve on the bottom of the drier sticking open. Hope this helps.

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