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No air, need help
Got the coach running for the first time this season. Let idle for about 20 minutes. Coach never raised up. Checked the gauges, hadn't moved off of 20 lbs. Tried the air line drain valve in front of left rear tires, only got minimum air flow. ...

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  • bbeane
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Re: No air, need help
Reply #1
Go back to the air compressor you will see an aluminum valve with a small hose going to it. That's the d2 air governor give it a small love tap or 2 with the engine running, it controls the air compressor. Use the search function at the top of...

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Re: No air, need help
Reply #2
Larry,
In order from simplest to more complicated;
Brake tank drains up front, Popet valve on wet tank, D2 governor, air drier,.  With the engine running, I would start by placing my hand under the purge valve to see if I could feel air coming out....

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  • John44
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Re: No air, need help
Reply #3
Would start at the source and trace thru the D-2 regulator and the air drier,the source being the engine driven air compressor,see
if you can locate a line coming off the compressor and see if it's pumping air.

Re: No air, need help
Reply #4
When I had a similar problem I discovered that the problem was the air dryer. If your air dryer hasn't been serviced in several years then that could be the problem. Suggest searching the forum for "air dryer."

Re: No air, need help
Reply #5
Thanks everyone. I will be burning up the search function tonight, so if your forum useage is a little slow, I'm sorry. I have the manuals here at the house so I should be able to locate all the items mentioned. After work tomorrow I will begin...

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Re: No air, need help
Reply #6
D2 $15-20. Love tap means smack it lightly with hammer or cresent wrench

Re: No air, need help
Reply #7
If that doesn't work take the plastic cone shaped cover off loosen 7/16 lock nut and  screw in the pressure adjustment screw one or two turns CW and one or two turns CCW

Re: No air, need help
Reply #8
Just had the same thing this past week on mine. I decided to go cheap first and changed the Governor...no dice so I started digging more and found the bottom of the air dryer venting out as fast as it was pumping air so wasn't gaining pressure....

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Re: No air, need help
Reply #9
Thanks everyone. I've spent the last 3 hrs searching past posts and it seems likely the dryer, but I will check the D2 governor first. I have no records from previous owners of dryer being worked on, so I fear for the worst. Even if it is the...

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Re: No air, need help
Reply #10
Been replacing our air dryer annually. From what I've read here and told by others, if air dryer fails it can send "gunk" throughout the air system with the potential for multiple component failures in the air system. May be pricey to replace but...

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Re: No air, need help
Reply #11
Yes I've read the horror stories also over the years. Didn't know where to start looking but have a better idea now. I have only put on 1000 +/- miles on the coach since I have bought it, so I hope that I don't have the dessicant problem. Never...

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Re: No air, need help
Reply #12
Just had the same thing this past week on mine. I decided to go cheap first and changed the Governor...no dice so I started digging more and found the bottom of the air dryer venting out as...


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  • hdff
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Re: No air, need help
Reply #13
I changed my dryer last year with a Re manufactured unit I got at Napa. If your somewhat good with a wrench you can do it... I did mine at my storage spot..  and if it does go bad it is not "gunk" but powder that goes thru the system, you will...

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Re: No air, need help
Reply #14
It looks like mine that is still on the coach. Will look this afternoon.

Larry

Re: No air, need help
Reply #15
It looks like mine that is still on the coach. Will look this afternoon.
If you have the same dryer, then you could try running the engine again and see if you feel air flowing out bottom of...

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Re: No air, need help
Reply #16
 While I believe the problem is compressor /D2/ dryer, start at the D2 and make sure that it gets pressure from the compressor.
 If it drove to the storage lot with air , it is likely that the dryer worked fine.   Fire it up and  feel the dump...

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  • John44
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Re: No air, need help
Reply #17
Think were all telling ohso the same thing in different words.

Re: No air, need help
Reply #18
If it drove to the storage lot with air , it is likely that the dryer worked fine.
In my case the dryer worked fine when it was put into heated storage for the winter-- but didn't work...

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  • jor
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Re: No air, need help
Reply #19
Here's where the D-2 governor is on a 97.
jor


Re: No air, need help
Reply #20
I had a failing d2  controller on our coach when we bought it.

Pumped the brakes till all the air was gone on the dash gauge.

Started motor.  Coach built pressure after that.

Replace d2 valve.  Adjust to 110/130 psi for better brakes

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Re: No air, need help
Reply #21
Ok guys here is what I got. Started the coach, air gauges went from 0 to 30 and stopped. Never got above 30 with engine running for about an hour, both low and high rpm. Tried persuading the d2, which is mounted directly on the compressor behind...

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Re: No air, need help
Reply #22
Did you put your hand under the purge valve while it was running to see if you could feel the air coming out? It is pretty easy to tell, not a subtle thing at all if it won't build more than 30lbs.
Don

Re: No air, need help
Reply #23
Yes, I took a rag and cleaned it up some. Didn't notice any air coming out at all. Not near the pressure from the wet tank valve.

Larry

Re: No air, need help
Reply #24
The thinking that leads me to the following recommendation is this: Unless you know when the air dryer was last serviced/replaced then you can expect it to fail at an inconvenient time and place. Therefore, eliminate that possibility and proceed...

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