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Power Gear air Leveling

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Fred Cook:
I have been having problems with my air leveling system. It will initially automatically level fine. But overnight the coach will lean way over towards the driver side. I know I am losing air somewhere, but there may also be a problem with the auxiliary air pump working. I have never worked on a system like this before so I don’t know what that air pump looks like, where it’s located or how to troubleshoot it to see if it even works. Has anybody had any problems like this? It would be nice to have a step-by-step instruction sheet and how to solve this problem.

David T. Richelderfer:
I found numerous messages by doing a search using the argument "aux compressor viair".  Various messages answer all the questions you asked.

Fred Cook:
Thanks, Dave. Just wondering, the coach tends to lean a lot more the colder it gets. Is this a common thing with air level coaches? During warm weather, it stays level for a much longer time.

David T. Richelderfer:
From my reading here in the Forum, I would say many, if not most, coaches tend to lean... some quickly within a few hours versus some slowly over a few weeks... and anywhere in between for that matter.  Our coach, when parked here over the winter in Yuma has its air dropped, so it's sitting on the bottom of the airbags... thus, no leaning.  When in Oregon over the summer, the coach is parked on a down-sloping side-of-the-garage yard with its tail down and nose up.  There it will sit for several weeks while its nose will slowly settle down a bit to its curbside.  Not much cold weather in our lives anymore!

Only one time in over 13.5 years have I heard the auxiliary compressor running.  I didn't know what the noise was and shut it off.  lol  I later guessed it must have been the auxiliary compressor.  And the noise was coming from between the dash and nose, to the curbside of the generator.

Steve Huber:
Fred,
It sounds like you may have 2 issues. Do you hear a compressor running at night? This would be the auto leveling compressor that senses low air pressure in the leveling system and turns on to add more air. It's located in front of the steps and is accessible by opening the front cap. With the coach losing level overnght you should hear the compressor running. The OEM (Thomas?) compressors were not long lived. Viair makes a cheaper and more reliable unit if that's one or your issues. I posted a procedure to replace the Thomas with a Viair after I did my conversion. I suspect you also have a leak in the left side air system; Bag, Line, or fitting. Only ways to find it are to hear air leaking (if you are very lucky and leak is significant) or to use a soapy water spray and look for bubbles in the aforementioned components and at the auto leveling compressor. Be sure to block the frame up when working under it. The Leveling section in Coach Assist has info that may be of help too. Also, Common Problems has a comprehensive writeup on the Air Suspension system in the Chassis section. It's located on the same web page as Coach Assist.
Steve

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