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Old 10-27-2021, 05:24 PM   #1
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Air Leak

I have a 1999 American Dream DP in pristine condition with 42000 miles. It has been stored indoors it's entire life and never driven in salt or snow.
For the past 3 years it has had a slow air leak in the front, and after a couple of days the front airbags deflate.
Now I have a leak in the rear, and both the front and rear bags defate overnight, and the pressure gauges, after 24 hours read around 75 pounds.
I have been over the entire chassis undercarriage and in the cargo bay trying to listen for a leak with no luck at all. There is no corrosion anywhere, and I have sprayed every fitting with bubble soap and can not find a leak anywhere. I am trying to get it ready to go on my annual trip to Florida, but I can't go with this issue going on.
Can anyone offer any advice relative to something I may be overlooking?
Thanks in advance.
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Old 10-27-2021, 05:39 PM   #2
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If you have HWH leveling system I would start with the 6 pack solenoid O rings. They are under the solenoids between them and the valve body. That is the problem i had with my old coach
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Old 10-27-2021, 05:59 PM   #3
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Air unit up and spray the complete air bag from top to bottom. Wait 30 or 40 minutes and go back and check. You might see small air bubbles at the top of air bag. Doesn't take much of a leak for it to go down overnight.
My point is spraying all over but sometimes it takes time for the leak to show itself. You can try electronic leak detector as another way.

Good luck
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Old 10-27-2021, 07:00 PM   #4
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Quote:
Originally Posted by Roland Trombley View Post
I have a 1999 American Dream DP in pristine condition with 42000 miles. It has been stored indoors it's entire life and never driven in salt or snow.

For the past 3 years it has had a slow air leak in the front, and after a couple of days the front airbags deflate.

Now I have a leak in the rear, and both the front and rear bags defate overnight, and the pressure gauges, after 24 hours read around 75 pounds.

I have been over the entire chassis undercarriage and in the cargo bay trying to listen for a leak with no luck at all. There is no corrosion anywhere, and I have sprayed every fitting with bubble soap and can not find a leak anywhere. I am trying to get it ready to go on my annual trip to Florida, but I can't go with this issue going on.

Can anyone offer any advice relative to something I may be overlooking?

Thanks in advance.


After 22 years air bags have to be shot.
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Old 10-27-2021, 07:53 PM   #5
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When your under there, spray soapy water all over the ride height valve on rear......the front should have a ride height valve on each wheel end, wet them as well.

But if all bags are leaking down usually it's at the dump valve.
On your chassis, I think it's mounted just behind steer axle. Cover it with soapy water.
If you have a suspension dump switch on dash, it'll work in conjunction with the power gear leveling system....... however some A/C don't have the dash dump switch, but you'll still have the dump valve.

There's a couple of threads around here on the dump valve. Search over in the Fleetwood section.

Be Safe under there! If it leaks or goes down with you under it, ain't no happy ending!
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Old 10-28-2021, 06:42 AM   #6
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Have you noticed if your air system is purging a lot?
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Old 10-28-2021, 07:54 AM   #7
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Not really
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Old 10-28-2021, 08:02 AM   #8
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What Leveling System Do You Have?
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Old 10-28-2021, 08:15 AM   #9
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Power gear
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Old 10-28-2021, 08:19 AM   #10
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Agree with Mackwrench - you need to crawl under the chassis with a spray bottle of soapy water.
This is a pic of my leaky driver side ride height valve. Looked good before I sprayed it down


After:


Also spray the moisture ejectors on the bottom of the air tanks - I had 3 start leaking in a little over a month.
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Old 10-29-2021, 08:03 AM   #11
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Thank you all for your advice. After checking every valve, tank and fitting several times with bubble solution and finding no leaks I have decided to take it to a truck shop and have them replace all the air bags.

I did find one tiny, inconsequential leak from a device I can't identify.

Can anyone tell me how to add a photo?

You suggestions are much appreciated.
Thanks,
Roland
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Old 10-30-2021, 09:52 AM   #12
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Quote:
Originally Posted by Roland Trombley View Post
Thank you all for your advice. After checking every valve, tank and fitting several times with bubble solution and finding no leaks I have decided to take it to a truck shop and have them replace all the air bags.

I did find one tiny, inconsequential leak from a device I can't identify.

Can anyone tell me how to add a photo?

You suggestions are much appreciated.
Thanks,
Roland

See the link from the FAQ section on the main page. Good luck.

https://www.irv2.com/forums/faq.php?...b3_attachments
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Old 10-30-2021, 02:33 PM   #13
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Can anyone tell me what this device is?

I sprayed every valve and fitting under my coach with soapy water and this slow filling bubble is the only leak I was able to detect.

I have decided that since my coach is 22 years old I should just go ahead and replace all the airbags. I'm going to have it done next week.

How much should I expect to pay for new airbags, installed?
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Old 10-30-2021, 04:00 PM   #14
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.....well at least you found out why air bags are leaking down. That's the dump valve. It'll still leak with new bags

Some air bags are hard to source right now, but the rears are about a hour labor each, and figure about hour and half each for front...
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