Assuming you meant what is the common cause of rear air suspension LEAKS:
As the airbags age, they can develop leaks. That's probably the most common start to the problem. But it gets more complex.
Initially the automatic suspension leveling sensors and brain will have the air compressor pump more frequently in an attempt to keep the car where it should be. Eventually the compressor may run almost continuously, and it was never designed for that type duty, and will burn out.
So dependfing on how long and severe the failing suspension, it might be a case of replacing the airbag(s), or the vastly more difficult and expensive replacement of the air compressor as well. In my 1995 Town Car the compressor was at the front of the car on the driver's side, roughly underneath where the battery is located if I remember correctly. I think my town car was about 10 years old with 100,000 miles when the rear suspension failed. (By failing I mean it would no longer level the car...it was still at that time driveable.)
Rather than gamble and spend over $2000 on repairs (as my independent shop thought it was the computer that needed replacing, an analysis I disagreed with), I opted to order an air bag suspension replacement kit, consisting of coil springs and new rear shocks, from the web. I had them shipped to my mechanic's shop, they replaced the air suspension on a time-only charge, and I drove away happy.
I think the parts from the web and the labor totaled about $650, and had I been willing to take the time I probably could have swapped things on my own. From the instructions it wasn't that tough. By the time I drove a few miles home I was used to the coil spring suspension.
I was happy with this decision the rest of the time I owned the car. The only difficulty others have had is this may result in a permenant air suspension warning light on your dashboard. I didn't have that trouble because my coil spring supplier was aware of it and told me which wire at the computer board (located behind and below the glove box) to cut. (And before you ask: I know longer remember which wire, and no longer have the car to go look for it.)
Good luck,
Paul
No, a bad rear sensor to an air suspension compression would not directly make a motor not work. It can cause a battery to drain which would cause starting issues.Ê
I'm pretty sure all expeditions came equipped with rear air ride suspension. meaning that there is a malfunction with the air suspension. could be anything with it including: switch is turned off, level sensor failed, air lines or air bags leaking, air pump failure, blown fuse.
how do i find the compressure for my rear suspension? or any possible issues for rear air suspension wire issues.
On a 1997 Ford Expedition : ( NO ) not on the front suspension It could have the REAR load levelling air suspension
depending on what model you have it is usually on the rear suspension frame.
No.
The Expedition can have the regular rear suspension...coil springs, shocks, etc or it could also have been equipped with air suspension. If yours is leaning to one side I'd bet you have air suspension and a bad air bag.
There is no air valve for the rear air suspension as it is controlled by an auto-leveling system unless of course you change to manual fill air shocks then it could be anywhere.
Nozzle to fill rear suspension manually 98 navtigator
if the unit has 4 wheel air suspension then the frt sensors are located on the lower frt control arm and on the rear control arms in the rear if it only has rear air suspension the sensor is located on the rear axle on the drivers side and is attached on the frame it is a very simple level sensor
If it has air bag suspension, air bags could be shot or the air compressor for the air bag suspension not working.
Check for proper air pressure in rear tires.