Air Dryer Question
I have a Haldex PurEST air dryer on my 2008 Winnebago (with 6.7 Cummins ISB). If I accelerate from a stop at a pretty good rate, the air dryer makes a hissing sound until the rpm level of the engine drops when the transmission shift into 4th gear. While driving with a Cummins tech for an unrelated problem, he suggested the noise was likely from a faulty turbo saver valve in the dryer unit. Has anyone had a similar issue? Other than the hissing under acceleration, the air system seems to function appropriately.
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