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check the ride height air valves as I suspect that there may be a problem there . When parked the valves will be sealing off correctly but when in use as in driving the constant variations may be letting more air out than the valve will be letting in to maintain ride height
The Stock Air Bags self Leveled, your new System should have come with PAperwork or is there a Air Nozzle that you have to fill? The Bags should come with a Pressure Window for a Firmer Ride or Softer Ride.
EACH MANUFACTURER has their Own Particular limits and ranges...
Have you checked all air lines, are they all tight & have the orange O-rings on them, this includes the one that goes to the top of the solenoid on the air bag that you're having the problem with, Then you might want to inspect the air bags itself, for leaks and cracks. Don't forget to turnoff the air ride system, the button is in the trunk before you jack up the car. Finally, there is a way to check the system without any special tools, just a jump wire. Let me know if you like to know how to do so.
I had the same problem with my '02 Envoy 4x4; had the soap test done and there were no leaks; also had the air compressor motor checked and mechanics said it was fine. The rear air bags were worn and cracked so I had them replaced. It lifted and rode at the correct ride height for a few weeks.
After having the rear air bags replaced I noticed that it was starting to not lift as before. Had another diagnostic check; the air compressor was not forcing air through the system in order to lift the vehicle. The air compressor motor was replaced. Compressor comes on and shuts off now.
Vehicle is at the normal ride height now.
Rear air bags and air compressor motor were dealership parts; unable to find after market; not recommended to replace with used parts.
I had the dealership to run the diagnostics and had another mechanic to replace the parts. Total repair for bags, motor + labor = $1500
Any errors on dash ? Get a manual ! Resolve any errors. Next check for sound that compressor is running...it should run after a few seconds of 'Key On-Engine Off'' if air bags have low pressure. It is located (underneath air filter... left front).. Check for defecctive air bags and their solenoid valves.
I found used replacements for all of these components on eBay.
Do you hear the compressor coming on when you start the truck or a few minutes into your ride? If so, you can rule out the compressor.
Could be ride height sensors, air spring bag leaks, or a leak in the air line(s). The dealership will ROB YOU BLIND if you let them.
See if a local mechanic will detatch and clean those sensors. Sometimes they'll corrode from time and weather.
If your air spring bags are bad, just google the part and you'll find the part for around $200. Have a mechanic also check the SEALS at the top of the air spring bag. Sometimes they expand and shrink with the weather and the air escapes from the bag, causing it not to inflate as it should or not at all. It's a really cheap fix if it's only the seals.
Any mechanic can test your air lines for leaks with regular soapy water. If you have leaks, the lines are easy to replace and not expensive.
Air suspension is controlled by the compressor in your engine compartment. The compressor runs when the suspension is not level. Either because you have loaded the car with exceptional weight and the system is now adjusting the ride, or you have a leak in the system, or you have a bad sensor.
If you have a leak, the most likely culprit are the air suspension bags, the air suspension solenoids or possibly the lines to them.
Try these sites:
I don't work for either of them. I own a 96 TC and have replaced my air suspension with coil springs form Strutmasters. Work GREAT and I have no more air suspension problems. Rides just as good too. You can't tell the difference.