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Hello, The control system for the leveling system while a bit complex, is not very complex as far as leak detection. It seems you likely have a leak in one or both of the air springs. There may also be a leak in the valving of the pump assembly. Generally the vehicle is raised for access and the air springs inflated. Once prepared, spraying the components with a solution of soapy water is used to locate air leaks. When it is sprayed, it will bubble. If no leak from the air springs is found, it is generally an internal failure in the valving of the pump assembly. The air springs however, are the more common failure,
I would have to check tomorrow on potential parts costs. Unlike shocks, air springs do not have to be replaced in pairs unless of course both are leaking. I can you that the last time I replaced a pump assembly, individual parts were not available. It is the entire assembly. There have been some issues with sensors and ride height but being as (I understand it) the concern is dropping overnight but then raising to a proper level it is likely it is a leak we are dealing with. Replacing the air springs could potentially be done with jacks however for safety reasons I wouldn't recommend it.
I can opt out if you prefer and another expert may be able to help with part numbers. My parts department has closed here on the east coast.
Hi, I'm CamI will answer your question quickly but we may need to discuss this further. Please reply to continue the discussion.
Level control compresor 25978169
Shock part number is XXXXX delco # XXXXX or the following, 15172342, 25820694, 25820699, 25865982 but you need the VIN and a dealer parts comptuer to match for sure which ones it is.