I've been chasing down air leaks for the last two months that I've had this new to me 09 Nimbus and yet my Aux pump cycles on and off all day.   It seems that when cold at night (Mid 30 degree) it runs every 7 min, and when warm durning the day...

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Have you checked for leaks on your slide bladders? Just had the living room slide bladder replaced because of a leak and now the bedroom slide bladder is leaking

Have you checked for leaks on your slide bladders? Just had the living room slide bladder replaced because of a leak and now the bedroom slide bladder is leaking

I think it was Dan Weaver who...

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Have you checked for leaks on your slide bladders? Just had the living room slide bladder replaced because of a leak and now the bedroom slide bladder is leaking

I'll get up on a ladder today and...

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You can turn off the valves that supply the air to the slide out air manifolds to see if that stops the frequent cycling.

You can turn off the valves that supply the air to the slide out air manifolds to see if that stops the frequent cycling.

Are those located in the same bay as the Aux pump?


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Are those located in the same bay as the Aux pump?

On a 2003 U320 they are.

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On a 2003 U320 they are.

And they look like this in a 2003, except instead of red-handled 1/4 turn brass valves (see above the solenoids), the original valves have black plastic handles.  On the...

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If you have an older coach than the 03 or 02 with these valves OEM they are not hard to add to yours. I did it in my 2001. The valve isolates the slide seal. Add a pressure gauge as well, your slide seal should have about 12 psi (some variation...

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What I did is pulled the inline fuse to stop the pump and the coach stays level and the seals are inflated.  Is there a pressure sensor that could be faulty?

The pressure switch, usually has a gray cover, can go bad or stick open or closed.  Mine would stick open and not come on sometimes.

The water separator on your setup has a solenoid valve on the bottom that closes when the pump runs and opens...

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The water separator on your setup has a solenoid valve on the bottom that closes when the pump runs and opens when it shuts off. These can fail as can the plastic bowl of the...

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RE: this statement from above- "The water separator on your setup has a solenoid valve on the bottom that closes when the pump runs and opens when it shuts off. These can fail as can the plastic bowl of the water trap."-....

a couple of weeks ago...

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The 12 volt compressor was running constantly which in my mind meant there had to be a substantial leak and should have been easy to locate.   After isolating the slides, coach remaining level and soaping down the lines replaced the pressure...

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a couple of weeks ago I was having same problem with  compressor on my U270 not shutting off and it turned out to be the plastic bowl had cracks

Exactly as I described above - if the pump won't...

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And they look like this in a 2003, except instead of red-handled 1/4 turn brass valves (see above the solenoids), the original valves have black plastic handles.  On the 1/4 turn valves,...

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You should be able to use a standard ball valve like Roger detailed. Something like this will work.
1/4 Inch Ball Valve NPT Air Compressor Brass Valve Female Male Shut Off...

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You should be able to use a standard ball valve like Roger detailed. Something like this will work.
1/4 Inch Ball Valve NPT Air Compressor Brass Valve Female Male Shut Off...

Perfect!  Thanks so much

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See Michelle's picture in Reply #7.  Ball valves work great.