Rear air suspension blues
 

I rep,aced both rear bags with new Arnott brand bags. They seem to lose height in a couple of days. I also rebuilt my compressor as instructed from this forum. I thought a worn out compressor might be losing pressure.
Not so, I’m still getting sagging overnight. Oddly, it’s dead even. No tilt at all. They both sag at same amount. I did a soak test and found
No leaks. I did not check the fitting on top of the bags. I also did not check each bag for leaks because they are 2 weeks old.

Where do I start on this madness?

Check the overpressure valve after the compressor, it my have a slow leak there.

Soapy water is definitely in your future....

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Ugh, air suspension woes can be awful to troubleshoot. I sprayed gallons of soapy water into my wife’s 2015 Grand Cherokee and still couldn’t track a leak down. I changed it all out to springs in the end.

I’d focus on where the air might be leaking from which would lower both sides equally. The relief valve or compressor seem to be the only place in the system what is common to both sides. Or maybe the reservoir itself, or the hose that feeds it from the compressor could be leaking? I can’t recall the plumbing set up specifically.

Either way, I feel that it has to be some place that both sides have in common. Two new airbags leaking equally, independently seems super unlikely.

You checked the big accumulation air tank under the RS cladding? It's huge and has quite a few fittings plus a valve or two if memory serves.



I went through replacing and troubleshooting the system over the course of about 6 months. I ended up replacing with BCR coilovers...