Check your rear shocks. On the fender, push with your body going down. Upon releasing, your car should go up and down one time then settle. If it goes beyond or hesitate to move, you have a problem with your shocks. I think you also have a problem with the shock absorber bush. It does not matter if you have a new or old shock absorber. The lifespan of the shocks depends on the way you drive on bumpy roads.
I would check the shockies for a bent rod that is stopping the car from levelling out .. Check that a suspension rod /point has not gone over centre and is holding the car up.
SOURCE: 03 lincoln navigator air suspension
you need to check your real axle sensor it may have come loose or broken
SOURCE: 2001 lincoln navigator rear suspension?
Here is how to tell if system is working.Get into the vehicle and close door. Set ignition switch to on position and move the gear shifter to neutral. After a few secs. you should hear the compressor turn on. If it comes on then put shifter back to park leave ignition on and exit vehicle. Compressor will stop when you open the door but should start back up in a couple of secs. after you close the door. You can then walk around the vehicle and listen for leaks.
If compressor does not come on there are 3 fuses and a solid state relay that controls it along with the module.
The 3 fuses are no. 109(50amp) in the battery junction box under hood.This is the direct feed to compressor thru the solid state relay. The other 2 fuses are located in the interior fuse panel and they are no. 6 (5amp) and no. 12(15amp).
What we usually see though if compressor does not run is either a bad compressor or the solid state relay. They both are rather expensive so I would have an experience tech look at it then.
However If you feel confident enough and have a voltmeter or test light respond back and I will tell you which wires to check.
SOURCE: 2003 Lincoln Navigator air suspension
I would recommend going to strutmasters.com and taking a look at our conversion kits. these convert you from the airbag to a powder coated American made steel coil spring that is guaranteed to last the life of the car. Airbags and compressors are constantly having to be replaced. Also something alot of people don't know is that theses air suspensions are not meant to be in temperatures above 90 Degrees or below 40 Degrees. That is most of the world. The temperature will cause you to replace alot of bags. and typically when your replacing a bag you are going to have to replace the compressor to because the bag had a hole or small crack in it causing the compressor to over work and it will die. I posted the link below so you can take a look http://www.strutmasters.com/lincoln-suspension-parts-s/1.htm I hope I was of some help Good Luck!!!
SOURCE: Air Ride Suspension Issues for a 1999 For Expedition 5.4L
I just experience problem with a leak in one of the bags in the back n because i didn’t have the money then to take care of the problem my air compressor burned. I just recently changed the bag and I found it at this website for $160 and the compressor is $210 + shipping. They r a manufactor so what they do they sell u refurnish parts that r as good as new and cheap. U purchase the item and sent them the broken item back n they give u a credit of $50. I made both purchase an air bag n the compressor n so far everything is working fine. The air bag is super easy to change but the air compressor its a little more complicated. The website is http://www.suncoreindustries.com/ and they even sent u the instructions on how to do it urself. Hope this was helpful!
SOURCE: The rear air ride suspension on my 98 lincoln navigator
Could very well be faulty relay, bad fusible link, or a fuse in general. You can trace the wiring or view a free repair manual at autozone.com to trace wires to find faulty device. You can use an ohmmeter or multi-tester to test relays and fuses.
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