There are a few things that could be wrong. 1- It could be the computer located in the trunk behind where the switch is for shutting the air ride off. 2- A leak in one of the lines or the bags. 3- The compressor is bad. 4- A bad air bag solenoid. 5- A bad height sensor.
The Air Ride system can be scanned for trouble codes too that can help you better diagnose the system. Also there is a Club you can join and get a lot of help from them too, go to: " thelincolnmarkviiclub.org "
sensor, go to markviii.org they have a total break down of the air ride
Your front air suspension bag has a leak in it.
Leak at airbag or fitting "dump valve" not closing
On a 1999 Lincoln Navigator : The air suspension shut off switch is in the front passenger footwell , by the kick panel ( for any time you are changing a tire , if the vehicle is being towed , or if the vehicle is on a hoist that allows the wheels to hang down , shutting off the air suspension system will prevent any damage to the system )
Inside the trunk on the driver side. Up = suspension activated. Down = deactivated
1995-1997 Town Car The module is located behind the glove box. Flip the glove box down and locate the air suspension module mounted on the heater core directly in front of you.
Your air suspension bag has a leak.
there is a leak in one of the rear air bags or in the air pump(in front) or the connecting air lines
I replaced the air suspension on my 1993 town car with one of Strutmasters air suspension conversion kits. My baby rides good again and they have a lifetime warranty. Hard to go wrong.
I believe that there is a reset switch/button behind the panel on the front passenger side where you turn off the air suspension. Down where the front passengers feet would be. you will have to take off the plastic door step (has the Lincoln symbol on it) in order to take that panel off... You can pop the door step off with a flathead screw driver...
Most likely your air suspension bags (or the pump) has failed.
On the Lincoln Continentals, the air suspension system works in sets of two. In the 1990 Continental (which I used to have) it was front and back. If one front air shock (or one rear one) has a serious leak, that end looses suspension. In the 1992 (which I have now) it is set up for side-to-side (passenger side or driver's side). If there is a leak anyplace on the driver's side, for instance, the whole side settles down to the fail-safe mode, which is still driveable. In fact, if you shut off the entire system (in the trunk), you will feel like you are riding in a Corvette.