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Old 07-27-2021, 12:14 PM   #1
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Mystery Air Leak

Greetings!
Just wondering where to look for a mystery air leak in a 2002 Magna. The front of the rig drops overnight! Took it to a reputable shop and they can't find the leak. We replaced the front air level valves and the problem still persists. They said the airbags (original) look good. They have soap sprayed the entire system for two days now and just can't find the leak. Any suggestions?
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Old 07-27-2021, 12:27 PM   #2
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The ride height valve seals the air into the lines going to the bags and the bags themself.

If they are deflating, it will be there.
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Old 07-27-2021, 12:39 PM   #3
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That's what I was thinking. I mentioned that to the tech and he said there are no leaks detected at the bags. Should I replace those? I hate to just throw money at it.
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Old 07-27-2021, 02:52 PM   #4
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Its probably a very small leak and nothing to worry about.

Use it as it is. Your levelers will hold it up while camping.
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Old 07-27-2021, 02:59 PM   #5
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The hoses going to my air gauge in the dash were loose. They are sort of like gator/shark bite fittings. They just have to be pushed in correctly. I pushed them in and they don't leak anymore.

To determine if the leak is too bad to be safe just perform your safety precheck.
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Old 07-27-2021, 03:10 PM   #6
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With spray kiddie bubbles, you should be able to find a leak that goes from 120 to under 30 PSI overnight.


Do you have air leveling or jacks? If air leveling, that is another thing to check.
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Old 07-27-2021, 04:07 PM   #7
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Quote:
Originally Posted by twinboat View Post
Use it as it is. Your levelers will hold it up while camping.
Quote:
Originally Posted by wolfe10 View Post
Do you have air leveling or jacks? If air leveling, that is another thing to check.
There are no separate levelers on the DynoMax chassis, only air leveling.

smacdiesel, when I recently had my air bags replaced I was told there were leaking air fittings that couldn't be soap tested while the bags were in the way. Might be the same situation for you.
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Old 07-27-2021, 04:34 PM   #8
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The leveling valves are not in play when the coach is parked and the HWH system is NOT in the travel mode.

My bet would be a solenoid valve. They have O rings that can fail and leak.

NOTE: This applies to the HWH 500 system. I can't say for any other model.
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Old 07-27-2021, 04:55 PM   #9
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If you have air leveling, then the auxiliary compressor should keep the system pressure up.
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Old 07-27-2021, 04:57 PM   #10
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The leveling valves are not in play when the coach is parked and the HWH system is NOT in the travel mode.

My bet would be a solenoid valve. They have O rings that can fail and leak.

NOTE: This applies to the HWH 500 system. I can't say for any other model.
Agreed and FWIW, my bet also. My reservation with that diagnosis, though, would be if they're leaking enough to drop the coach's front end overnight then I'd think soapy water would show the leaking or you'd actually hear the leaking. Aren't mystery air leaks fun?
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Old 07-27-2021, 08:21 PM   #11
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I experienced the same problem with the rear air bags on our Magna. It was checked by several mechanics who said all was fine. It took me quite some time crawling around under the coach spraying soapy water and I finally found the leak was from a solenoid valve on the rear air manifold. It was intermittent so it did not always bubble up. Replaced the valve and all is good now. I would suggest checking your front air manifold. The valves can be ordered from HWH. Good luck!
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Old 07-27-2021, 09:27 PM   #12
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Thanks for the replies. The shop is going keep looking. Very frustrating.
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Old 07-29-2021, 05:41 AM   #13
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If you have a HWH air leveling system it is possible one of the valves is leaking. I could never see the air bubbles but I heard spitting when it was wet.
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Old 07-29-2021, 09:26 PM   #14
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Before they fire the parts cannon again, I had a similar occurrence a few years ago. After soaping up every air related part under the coach, I bought a bottle of kids bubble soap.

After soaping the lower air spring bells, I saw faint bubbles coming out from the lower part of the air spring. This bag looked almost new but when I removed it, it was apparent the junction where the airbag rubber connects to the metal bell/cone/whatever was slightly leaking.
New bag installed and no more leaks from the rear.

The new air spring, as compared to the leaky one, looked exactly the same at the juncture of the rubber and the steel.

YMMV
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