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Old 08-19-2022, 05:51 AM   #1
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air release

Morning,

When my coach is sitting in level mode in my driveway air is released from the front end then the compressor switches on airs it back up to the same level. It will do this not in a consistent manner, but enough to wonder what the heck? A guy told me they will do that when it is very hot outside which it has been. It seems there would be no leak because of the release of air. Just curious what your thoughts are.

Thank you,

Stone
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Old 08-19-2022, 06:06 AM   #2
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air release

The HWH system wakes up every 30 minutes and checks for “level”. It can release air, possibly over release. Heat could cause the air to expand and over inflate. A thought.

You can stop the controller from “waking up” by pressing emergency stop after Coach is level. Stops controller from making any adjustments.

Brian.
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Old 08-19-2022, 07:39 AM   #3
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Quote:
Originally Posted by BrianGlenn View Post
The HWH system wakes up every 30 minutes and checks for “level”. It can release air, possibly over release. Heat could cause the air to expand and over inflate. A thought.

You can stop the controller from “waking up” by pressing emergency stop after Coach is level. Stops controller from making any adjustments.

Brian.
Thanks Brian. It is just a little odd that it would let out air, same amount from what you can tell by listening, and then pump (again just listening) the same level back into it. I will look into it, appreciate it.
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Old 08-19-2022, 07:52 AM   #4
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And ultimately the PSI gauge goes to zero on our coach
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Old 08-19-2022, 09:28 AM   #5
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Yes, the sun heating a side of the coach can cause the 30 minute adjustments but leveling valve leaks can, and often do, lead to frequent adjustments. For instance, if one corner of the rear suspension leaks down then then HWH controller may bleed down both sides of the rear to level the rear, or depending on the terrain, it may bleed down the low side of the coach to square up the overall coach and then begin the leveling process. To say it another way, the HWH system first tries to remove any twist of the chassis and then bring the chassis to level.
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Old 08-19-2022, 09:30 AM   #6
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air release

Quote:
Originally Posted by Stonefish View Post
Thanks Brian. It is just a little odd that it would let out air, same amount from what you can tell by listening, and then pump (again just listening) the same level back into it. I will look into it, appreciate it.


You’re welcome. I’m addition the air supply solenoids (HWH six pack) or the Haldex ride heights valves may leak a little and add air to bags slowly while supply pressure is greater than air pressure required for air spring to accommodate “level”. Another thought.

Edit - the “time” duration for release and add may be different volumes of air as differential pressure and rate are probably different between release solenoid and air compressor fill rate. A thought.

Brian.
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Old 08-19-2022, 05:17 PM   #7
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I believe Brian is spot-on in his assessment of the problem. If the system can re-level by letting some air out vs cutting in the on-board air compressor, it will.
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Old 08-19-2022, 06:59 PM   #8
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Mine has done the same thing for over 10 years, more in the summer time when it's hot. It's always the rear that needs to level. When on the road if the wife gets tired of it coming on, I hit the emergency stop.
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Old 08-23-2022, 02:16 PM   #9
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I've never had an air release because of excessive heat build up in the bag. So, if I had symptoms like described by the OP, I'd think I had an air leak and the air release was the HWH system trying to lower the opposing side to compensate. When the system determines releasing air won't get the coach back to level then it turns on the air compressor to pump up the low side. I had all of that going on earlier this year after my rear air bags were replaced; fortunately, I was able to find and tighten the leaking air line fitting until the leak stopped -- and the release/pump cycling also stopped.
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Old 08-25-2022, 12:53 PM   #10
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I had a similar issue and I had a hole in the front drivers side air bag. Replaced it (really all of them), and haven't had a problem since. Coach stays nice and level.
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