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These Lincoln air suspensions are terrible. I have converted many over to coil springs at a fraction of the cost of replacing/repairing the bags. If the rear bags don't inflate, there is a broken air line to the bags or the bags are leaking
The air bags commonly go bad on these trucks as well as the Expeditions. They are called Air Springs. I sell better quality ones than those sold at auto part stores and they are also a bit cheaper than dealer parts. But either way the problem is you have bad air springs.
Under the hood there is an air compressor to fill the air bags on the suspension. With age the compressor draws excessive amps and blows the fuse. Check the fuse and see if it has popped. If so replace it. If the fuse is good ,locate the compressor and check the electrical plug to it to see if it has become corroded. If corroded pull the fuse and scrub the contacts with a brass brush untill clean. To keep it from corroding in the future apply some dieletric grease to the contacts and plug it back in. hope that helps, Rich.
It sounds like one of your air bags could have blown. I would check them first. I would also suggest checking into a replacement non air conversion kit from Strutmasters. I replaced the air system on my 2002 Navigator and saved a lot of time, money and headaches.The lines on my navigator had holes in them and I replaced the compressor twice before I realized it. Very costly. Avoid all the hassle and check out Strutmasters.
Sounds like your air ride suspension is either leaking air in the air bags, air lines,etc, or the compressor is not working. If your truck is still under warranty take it to the dealership to get it fixed or with a good mechanic. If it is an air bag or the compressor start checking online for any good, cheap parts because parts for this SUV run expensive.
Hopefully just needs to be reset, those air susp r expensive. Some susp come with a switch to turn on and off could be on the left or right rear back look for it turn off then on if that does not work, disconnect p bat terminal for 5 min then reconnect. Listen for suspension should make some noise.
the auto leveling is standard on the navigator.
first you have to understan that the auto leveling system is on front and rear of these trucks.
one way to tell is do you hear the pump running and do you have air in the front bags. and if you do you need a rear level sensor.