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Old 10-25-2016, 05:12 PM   #1
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Help with rear air bag dump valves

When I push the panel switch to dump air only the front bags deflate. The rears do not do anything. The first photo below is the two blue valves/solenoids that I think controls the bags.....is that true??

If it is where does the air go?? I see a line going in one side but the other side is capped. Maybe they were leaking and someone in the past capped them??

The second photo is the front setup.....only similarity is the blue color. There is an outlet where the air escapes when I hit the switch.

The third photo is an air line....I think?? It terminates right in the center of the engine compartment right above the trailer hitch. It has no air pressure when I remove the cap and it does not release air when I hit the dump valve. Does anyone know what this line could be?? It goes up toward the rear tank but it gets lost in a large wiring bundle so would be very hard to trace.


Thanks for any help.
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Old 10-25-2016, 06:29 PM   #2
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The third one can be used to fill your air tanks from an external source.
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Old 10-25-2016, 06:45 PM   #3
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I'd say you have an electrical issue with the two rear dump valves since they operate separately. Could be a blown fuse. The last picture looks like a disconnected air line. Since it ends at the engine I'd think exhaust brake.
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Old 10-25-2016, 07:28 PM   #4
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I have an air fitting upfront that was factoring installed with the standard air hose connection so don't think it would be that.

Monaco coaches came with Factory installed PAC brake so don't think it would be anything to do with the exhaust brake, also it ends nowhere near the exhaust side of the engine.

For the dump valves........If it is an electrical issue then both are affected, the front ones work so don't think they would be fused separately, can someone tell me where the air goes when they are deflated? I do not see an outlet like the picture of the front ones show.



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Old 10-25-2016, 08:17 PM   #5
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On each of the dump solenoid valves there is a open port that the air exhausts out of.

There have been reports of mud dabbers blocking these ports preventing the air from getting out.

One test would be to loosen the line going to the solenoid valve and see if the air exhausts. Next would be to check the voltage going to the valve when the switch is pushed, if there is no voltage there is something else wrong.

Agree with the the fuse, if the front works then the back should.

The air line at the back of the engine might be a line to hook up a braking system for a toad. Take the cap off and press the brake and see if air exhausts.
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Old 10-25-2016, 08:34 PM   #6
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Jacwjames, The only other outlet on the valve is capped, did you look at my picture?

I guess I will remove the caps and see if anything happens.

I would love to see a picture of someone else's valves that are similar to these.



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Old 10-27-2016, 06:54 PM   #7
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Come on guys, can someone with an older Monaco look at their rear dump valve and snap a picture so I can see if I am missing something? They are mounted on the frame on the right side of the engine in plain view with the engine hood raised.

Any help would be greatly appreciated.


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Old 10-28-2016, 07:55 AM   #8
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The ones in my 2000 Dynasty don't look like yours.
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Old 10-28-2016, 01:38 PM   #9
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Those are the dump valves, very similar to the ones on my 99 Exec. They are not capped - what looks like a cap is a sintered bronze filter - supposed to keep those mud daubers etc out. Each valve dumps the bags on one side of the coach, Electrically they are hooked together - one wire out of each valve is a ground - the other goes to the dump valve switch. you can check for power with a test light or you can jumper 12v to the hot lead and they should open.
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Old 10-28-2016, 04:57 PM   #10
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OK thanks, will check that, so does the air escape through that bronze sintered fitting?

If so mine appear to be clogged, the sintered portion is corroded and appears to be totally blocked.



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Old 10-28-2016, 06:55 PM   #11
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Yes - it passes through it like fuel through a fuel filter... mine were really corroded like yours and I thought they might be slowing the flow of air - couldn't find any locally so I bought a whole bag off flea bay - though they looked bad they were still flowing fine. just google "sintered bronze vent fitting" and some photos will come up - its a pretty tight matrix. I'd be shocked if they are corroded badly enough to completely block the air flow - and given that neither of them are working I'd say its much more likely you've got a small wiring issue.
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Old 10-29-2016, 05:15 AM   #12
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Thanks, you are probably correct in that I would be getting some airflow so hopefully it's something easy like a bad ground but I will check into it further next week, thanks again


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Old 10-29-2016, 10:14 AM   #13
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My Windsor just had small holes in the air manifold to exhaust the air. Mud daubers had completely clogged the holes with mud! I used a drill bit the same size as the hole and removed the mud. I didn't use a drill motor, just the bit in my hand. !
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Old 10-29-2016, 10:29 AM   #14
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I have a 98 Dynasty and there are elbow fitting in mine that are open to air. I think the elbows are in mine which face down are in there so nothing gets in the open outlet. Take
the plugs out and it will work. When you get the plugs out check to see it they are leaking
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