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I have not been able to fine a leak but have noticed that the compressor doesn't cycle as much when its warmer out. So I thought Iwould service my air dryer. Well it seems that the army has busted the plastic desiccant canister and the aluminum cylinder edge looks to have been attacked by a...

You know looking at the air diagram I see the fan clutch is also on the wet circuit... Another clue is when I start the fan is on... but the two service tanks has some air in them. It maybe the cab ride height valve leaking. Are these rebuild-able?

It unloads the same when parked or driving. I also hear a noise when the compressor is building pressure but don't know if it normal or not. The tone changes when I turn the steering wheel... I have uber sensitive hearing and hear things most people can't. I know the power steering pump is on...

When I drive down the road I hear the air dyer purging all of the time. About every 2 mins or so. I am in no way an expert on air systems on these trucks but let me tell you what I think I know. The air governor unloads the compressor when it get to the set pressure. That is PCHISS I hear from...