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Old 02-12-2019, 10:07 AM   #1
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Air Dump Issue

Good morning all!

When I do an air dump, I have noticed that the back does not deflate. The front goes down but the back stays up. Overnight, the back deflates. But, I notice that it does that whether I air dump or not.

Is there anything I can check on my own or does this sound like something I need to take to an RV repair shop to check?

Thanks
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Old 02-12-2019, 10:31 AM   #2
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There are two dump valves on the rear of your coach, it sounds like they are either plugged up so the air can't escape or they don't have power to them. The problem with air bleeding out of the system overnight is common and is caused by leaks in the air system. Do you need to contact a repair center? That depends on how handy you are and how good the repair center is. You would essentially be paying them an hourly rate to troubleshoot and fix your issue. That's an expensive proposition.

It's pretty easy to check out the dump valves. There should be two wires to your dump valves, get a DVM and check for 12 volts when someone pushes the dump button on the dash. Polarity shouldn't make any difference, one side is ground the other is 12 volts. If you have voltage then the valve is inoperative or more likely clogged up. Dirt daubbers like to make nests in them. The hardest part of this is finding the valves. Mine are easy to see at the rear of the engine as should yours since you have a side radiator too.

This is the only picture I could find of my dump valves. From this you can tell where to look. It's the blurry component in the foreground of the picture. This is the driver's side of the engine at the rear, just above the lower radiator hose.



Finding leaks is a dirty, time consuming job consisting of mostly lying on your back spraying the air suspension system with soapy water looking for leaks. You do it by airing up the system and then blocking the coach with either appropriately sized jack stands or cribbing. Then just follow the air lines and spray all the fittings and components. You'll likely find lots of small leaks. A system that deflates over 24 hours is not a real problem or safety hazard.
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Old 02-12-2019, 11:09 AM   #3
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Thanks for the detailed information! That's great information. That sounds like a job I will tackle over the weekend. Wasn't sure where the valves were located or where to start.
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Old 02-12-2019, 12:35 PM   #4
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Here's another thread about inoperative dump valves. They are different looking than the ones on my Dynasty, but it does have a couple troubleshooting tips for checking out the valves themselves.

Help with rear air bag dump valves
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Old 02-12-2019, 01:27 PM   #5
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Have you tried deflating the rear bags with the ignition on?
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Old 02-12-2019, 06:26 PM   #6
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Thanks guys!

Ali, I usually turn the ignition to the left when I do my air dumps. There is no power to that switch if the ignition is off. Does it make a difference if I turn to the right? Don't know if I ever tried that.
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Old 02-13-2019, 06:41 AM   #7
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Quote:
Originally Posted by SpottedJag96 View Post
Thanks guys!

Ali, I usually turn the ignition to the left when I do my air dumps. There is no power to that switch if the ignition is off. Does it make a difference if I turn to the right? Don't know if I ever tried that.
I dump from the on position, with the engine off. My hydraulic jacks won't function with the key in the accessory (left) position and I don't think my dump valves do either. You said the back does not deflate, from that I assumed the front did. I'd give it a try with the switch to the right.
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Old 02-13-2019, 09:38 AM   #8
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Ignition to the left allows us to dump air on our Windsor. I suspect there is a problem with your HWH control box, wiring, connections or solenoid valves. Were you able to locate the control box?
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Old 02-13-2019, 09:47 AM   #9
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Also wanted to send kudos to Dennis on his #2 response above. Fully agree on his sugfestions. He is one of the folks that i follow on irv2. Great person, always give great advise.
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Old 02-14-2019, 06:06 AM   #10
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I haven't been able to pull it out to access the back yet. We are having rain for the next couple days. Hopefully this weekend, now that I know what I'm looking for. I'll let you know if I am successful.

Thanks for all the help and advice!
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