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Old 01-07-2017, 12:36 PM   #1
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Mystery Air System malfunction

I've owned and lovingly cared for a 1996 Intrigue for the past 20 years and it has treated me very well, under $5K in repair costs and that included a cracked exhaust manifold. Recently however I've run into a problem I can't diagnose and wonder if anyone else has experienced the same. I have an HWH air bag leveling system which has always worked perfectly. Installed new ride height control units and new air bags around 2 years ago. Lately when I park it for storage, the rear air bags (both of them) raise some 2" above level travel position in about 24 hrs. Can't see them rising or hear any air noise. When I park I always shut off all coach and chassis battery switches, so no power is getting to the HWH system. No change in the front air bags, they stay at the same level travel height position. I don't level the coach when parking, just leave it in the travel position. To compound the problem, about half the time I lose all air pressure in the tanks. Gages go to zero. Other times the tanks stay above 100psi for days. I've sprayed all hose connections with leak detecting fluid, no leaks, no noise of escaping air, air dryer seems to work perfectly, can't seem to detect a problem.
I've a call into HWH but its a two week wait for a return tech call, so wondering if anyone here has a clue. I'm inclined to think it could be a HWH solenoid leak, but which one? Or two problems, perhaps the dryer is occasionally leaking air, though it cant be heard.
Help! Any clues? Thanks, Mike
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Old 01-07-2017, 01:52 PM   #2
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Sounds like a suspension level valve problem. Do you have 1 or 2 valves(left and right) for each axel? Could be that it slowly creeps up, then the level valve starts to dump air out and that drains your air tanks. Try dumping the suspension and see if the air leaks down. If it doesn't, then it must be in the suspension system some place. If it still leaks down it possibly could be slowly leaking out past a check valve in the air drier exhaust port.
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Old 01-08-2017, 05:58 AM   #3
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It does sound like the travel solenoid leaking but with both bags inflating not sure. Here is the HWH 500 series troubleshooting guide. See if this helps.

HWH 500 troubleshooting mauual.pdf
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Old 01-15-2017, 04:53 PM   #4
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My 1997 Intrigue (Gillig chassis) has a single leveling valve on the rear but there are 2 travel valve solenoids, one for each air bag. They are T'd together. Did you spray the leveling valve to see if it is leaking?

On my 1997 the rear solenoid block is behind the passenger rear tires so they see a lot of "weather". The travel solenoids are the top two if I remember correctly.



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Old 01-15-2017, 06:16 PM   #5
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That leveling valve feeds the travel solenoids. For the coach to rise I would think that one or both of those solenoids is leaking allowing air to flow to the air bags. If both sides are rising then it would seem that both solenoids are leaking as one solenoid only feeds one air bag. If this continues, eventually the travel valve would reach the point where it starts to bleed off excess air to bring the coach to the normal travel height.

I think it is possible that 20+ year old solenoids are failing. If you think about it, your RV spends most of it's time rolling down the road with the travel solenoids engaged, the raise and lower solenoids don't get nearly the same amount of use.

**** CORRECTION FROM MY PREVIOUS POST **** The travel solenoids are the two lowest of the 6 solenoids in that block.

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Old 01-18-2017, 08:19 PM   #6
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Mystery air solved - I hope!

Al last got a return call from HWH. They suggested I swap travel solenoid with either the raise or lower solenoids to see if that affects the issue. After 48 hrs, no air leakage, holding at 110 lbs when parked, the rear bags stay at ride height when parked. Everything perfect for now. Suspect slight leakage in the travel solenoids, may just have needed tighting? Thanks to those who offered solutions.
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