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If the bag hasnt completely failed (punctured or worn to leaking) they can come "unseated" from the base at the bottom of the "bellow" or bag. Not very common but possible. Alternatives to dealer parts and installation checkout ARNOTT air springs. The bag alone runs about $100. If you can afford it replace both fronts with the ARNOTT new generation one piece airspring. The are easy to install and offer little or no headache. Lastly, if you are a fan of the unsurpassed comfort of your Range Rover air-ride suspension, dont let anyone talk you into the coil spring conversion. Its not the same level of comfort and you will feel a big difference in handling. Good luck!
The easiest fix is to hook up a scanner on the suspension test plug. This will give you a test to each sensor. Some models may even record a history of performance.
Underneath the car, someone can use soapy water and spray the air lines and suspension bags to test for leaks. There are venting solenoids on each wheel to level the car and a Master solenoid called a "dump" valve to release all of the air
The system is tied into the doorjam and trunklid switches which must be closed to allow the system to work. Escaping air should be easy enough to find.
I have a 2000 Lincoln Town car, had the same problem, it was the rear air suspension/shocks. They are air bags basically that levels your car and it cost about $300.00 for each at the dealer for parts and install but it also has its own motor that inflates and deflates these air bags and I also had to replace that and that cost over $400.00 installed at the dealer.
Probably failed seal or air bag leaking air. Check again and try to see if this will do the trick. Sometimes pvc line could fail to deliver air to the bag too!
It just happened to me. I took it to a spring shop and had the air bags replaced with coil springs. It is an identical fit from a Crown Vic and only cost $200.00 total! Too much can go wrong with other parts of the air suspension. The ride is the same.
Your airbags probably have an air leak or are just starting to crack. Go to you tube and type in Suncore hummer suspension air bag replacement. They have a whole how to install that also show your suspension and how it fails
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