Spray everything with soapy water when aired up. Gotta be a leak somewhere. The air fittings on solenoid iirc are pushlock and if not seated fully will leak
I may be stating the obvious or am not understanding the problem, but the air suspension system 'vents' after x amount of time when the car is just sitting...this may be the reason for your loss of air when the car is off.
I don't know the answer about o rings in the solenoids. Based on your description I think it is an air leak,either bags, lives, solenoids. I don't think this would be it, but check air ride height sensor on watts link to rear axle
yes new bags come with new o rings for the solenoids, small for the solenoids, large for where it enters the bag. use soapy water and the leak can be anywhere.
Is there a check valve in the system maybe after the compressor to prevent it from leaking back down when the compressor is off? Or maybe it's built into the compressor?
I replaced bags and solenoids using aftermarket parts and i went through hell because orings supplied with the Dorman solenoids were the wrong size. I ordered two sets of orings from McMaster-Carr but i dont remember which ones fit.
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