I have been troubleshooting a problem with the suspension on my 2000 Navigator. I have bypassed the Compressor relay and have figured out that it has gone bad. The compressor comes on fine but appears to be only raising the front. The back is down on the wheel stops and when I get the compressor running the front starts to immediately come up but the back does not appear to be rising at all. Should I wait longer with the compressor running to see if the back will come up or am I looking at more than one issue with the suspension?
I have owned several air suspension vehicles. My Expedition was similar to yours. You may want to try the 4x4 switch because it will raise the body 1-2 inches higher. Checking its fuse would not hurt.
On most of my vehicles the suspension would work end to end, raising the front first. You could have 2 issues with the suspension. There should be valving to switch the air to the rear suspension after the front is up. I would wait longer for the rear to catch up.
If I had to guess why the front lifts first it would be to get the front off of the curbs and sidewalks when you park so the bottom doesn't drag.
There is a diagnostic plug for the air suspension and sometimes Autozone or Oreillys have the scanner for that special plug. If not, some alignment shops and all dealers would have it. Also Ford parts are often the same as Lincoln and cheaper., Someone may make aftermarket parts at a better price.
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