Could be a leak in the system or a tear in one of the airbags (which is what I had). I had to have one air shock replaced.
SOURCE: 2001 Ford Expedition XLT EB rear air bag suspension does not inflat
Sounds like the seals may have failed in the air shocks themselves. I also think you may have a bleeder valve problem. Follow the lines back and check the bleeder valve to see if it is leaking when you have someone else turn the vehicle on.
SOURCE: Air Suspension plomlem
1. make sure the switch is on (under the passenger side dash board). 2. check to make sure the relay is good (black little box under the right front bumper. 3. there are two (that I know of) switches/sensors. 1 is behind the left front tire. The other is up behind the spare tire. Taking the spare tire off gives you tons of room to work with. The sensors look like mini shock absorbers with black rubber and can be compressed and pulled easily by hand. Moving those will simulate the suspension going up and down and should trigger the compressor. 4. if the compressor doesn't come on (and all the above is fine) it sounds like your compressor is bad and should be replaced. I got one from Arnott Industries in Florida and they have been very nice to work with so far.
SOURCE: no air reaching air bags/compressor does not come on when car turned on
no air getting to air bag, have changed fuses and put in new air bag
SOURCE: air ride suspension 1997 ford expedition
If the compressor is working and actually pumping out air, might need to check your lines dont have a leak by disconnecting them from the bags. If pressured air is making it to the end of the line, then bags may need to be inspected and one or both replaced. However it is more likely that the lines are leaking or the compressor pump needs a service. Just a new set of rings in the unit. Good luck, hope it helps.
SOURCE: my air suspension compressor is
It sounds to me like your compressor got killed. What probably happened is that the airbag got a hole or tiny crack in it so the compressor has to work extra hard because it is like blowing up a balloon with a hole in it. Therefor the airbag killed the compressor. 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. I added the link below so you can check it out.
http://www.strutmasters.com/ford-suspension-parts-s/75.htm
I hope I was of some help
Good Luck!!!
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