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Old 01-26-2022, 08:09 PM   #1
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Air leak while in travel mode

Have a 2003 Monaco Windsor with HWH air leveling system and once I start the engine and tanks fill and go to travel mode you can watch the air pressure on the air gauge drop to 100 psi then compressor will kick on and fill to 150 psi and start dropping again once full. When coach is in leveling mode (have air only leveling system) there are no leaks.

Any idea on where I should start looking for this leak?
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Old 01-27-2022, 04:43 AM   #2
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It sounds like the air is dropping just because the air bags are filling.

If the "pressure drop" stops after the coach reaches ride height - then I don't think you have a problem/leak.

How long will the coach hold air (overnight, a couple of days) when the tanks are full and the engine is off?

If the Coach "keeps dropping air and refilling, over and over" while you're driving (in Travel mode) then I would check the Ride Height Valves (RHV). Possibly one of them has a bad seat and is letting air escape out the exhaust port, which is causing your pressure drop.

BTW, your air pressure governor is set a little too high. The air compressor should turn on when the air drops to about 90 psi and turn off around 130 psi. There is an adjustment screw under the rubber cap on the governor.
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Old 01-27-2022, 06:47 AM   #3
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Quote:
Originally Posted by CountryB View Post
If the Coach "keeps dropping air and refilling, over and over" while you're driving (in Travel mode) then I would check the Ride Height Valves (RHV). Possibly one of them has a bad seat and is letting air escape out the exhaust port, which is causing your pressure drop.

X2 on this, will be harder to diagnose safely but a spray bottle of soapy water goes a long way in finding leaks. The ride height valves aren't easily accessed, not sure if you can spray them down without getting underneath. I may take two people, on in drivers seat with rig in drive & foot on the brake while the other tries to spray down the valves.
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Old 01-27-2022, 06:59 AM   #4
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150 PSI for compressor CUT-OUT is well on the high side.


Please compare with specs for your chassis/coach.


Most governors are adjustable. If not, they are under $25.
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Old 01-27-2022, 08:36 AM   #5
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Thanks for the info. I don't think its the bags filling as I can start the coach in the driveway and watch the air gauge fill and once gets around 130 psi I will hear the air dryer blow off the air. After a few seconds the air will start dropping. Once it gets to 90/100 psi the compressor will come on and will fill to 130 psi and same thing happens.

I can have the tanks full and shut off coach and they will stay full for several days. Since both tanks are dropping at the same time could it be a leak around the air dryer?

Checked and the compressor come on at around 90 psi and shuts off around 130 psi so should be good there.
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Old 01-27-2022, 08:42 AM   #6
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Yes, air dryer could be problem. Can you feel any air leaking out around the bottom (discharge port) with the engine running?
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Old 01-27-2022, 09:54 AM   #7
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Gonna check that when I get home. That would be an easy fix I hope.
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Old 02-08-2022, 04:03 PM   #8
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I found an air leak from a the line that feeds the dash gauge. But my air would only go down when parked not driving.
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Old 02-08-2022, 05:08 PM   #9
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I had this problem and it was leaking at the pressure sending unit on the tank. Had the sending unit replaced and solved the problem. You could hear mine blowing air though.
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Old 02-08-2022, 06:02 PM   #10
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Check your parking brake system.

Could be the parking brake system. I just experienced this problem while on a trip to Tucson, AZ from Florida and back. Turns out air only leaks while the parking brake is disengaged. Try choking the wheels and release the parking brake. On mine, with engine off, i could see the gauge drop quickly. Now walk back to the rear of the coach and you should be able to hear the leak. Can be one of two places...the rear brake cans or something called an inversion valve, also located in the rear of a coach. I suppose it could also be the parking brake valve in the cockpit but my guess you would normally hear that due to its proximity. Hope this helps
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Old 02-08-2022, 06:14 PM   #11
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An inexpensive mechanics stethoscope is faster, less messy and easier to test in hard to reach places.
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Old 02-09-2022, 05:41 AM   #12
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Your compressor is good. As for your brakes your saying it does it only when started, if yes then it's not your brakes. Air leaks are sometimes hard to find when the engine is running. Does it leak with engine off and key on. If yes you will have to check were it's coming from. If you have air bags make sure you block the coach and not the wheel if you go underneath. Some people have crushed from the air bag going down.
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