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Did you lift rear end with jack if so there is a switch on the axle ...check this also check your fuses.....if all else fails coil springs are an alternative to the bags
What is odd is the compressor stopping after so short a time. It may be your only problem.
When you have a leak in the system, the compressor keeps running because the sensors do not signal for it to shut off. On your vehicle it is either being told to shut off prematurely or the compressor is triggering a circuit breaker.
There are ride height sensors on the rear. If the vehicle was lifted without turning off the Air ride, the sensors may have been stretched.
You can check for air leaks in the suspension bags, and air lines using a spray bottle of soapy water. There is also a Master dump valve that should be ahead of the Drivers front tire/radiator well area. It is not a concern unless there is no pressure in the system.
Finally, just as the engine can express diagnostic Codes, so can the suspension. You need a better scanner to do this function. It is the quickest way to find the problem.
The better scanners can hook up to a connector port and diagnose the air lift system. This saves diagnostic time and the expense of replacing good parts. The trigger for your air ride system is probably one that you would not imagine. The trunk lid switches and the door jam switches tell the car that it needs to lower or pump up the system. The idea is that you want the car lower to load passengers and to lift things into and out of the trunk.
When these trigger signals reach the solenoids it is their job to add or release air. At least your pump is working. The diagnostic scanner will tell whether the solenoid is bad or a signal is missing to the solenoids. There is a master dump valve in front of the drivers wheel well to lower all ends at once.
IF self leveling (gas struts) are faulty,when you come to a stop after driving for about 10 mins,the rear will not have risen to level.(still low).then they will need replacements fitted,they are not that expensive,compared to some air suspension types.(just in case im not clear,the rear pumps itself up AFTER moving off/driving and will settle when stopped for awhile after.)
you may find that the little air pump for the suspension has siezed, I had the same problem with my car and found that the pumps are only lightly lubricated with with a grease type lubricant but the lubricant eventually dries and the piston wont slide up and down the bore as the piston has rubber "O" rings on it and wont slide in a dry bore.
The pump for mine was located under the right side front guard.
I ended up removing the rear air shocks and replaced them with normal air shocks with the tyre type valve that you pump up at the garage, never had any more trouble after that.
Hope this helps
I had a 1999 Expedition. When you put the 4x4 on it raises the vehicle an extra inch or 2.
It may help to turn the 4x4 off. Two wheel drive is a lower air setting.
Your original pump may still be good. The problem can be in the front. The compressor is not filling the front suspension to the cutoff point. It will lift the rear after the front end is at running height. Since you lost the front end first, the remaining air bled out there and then the rear came down. Once you shut down the car the suspension was done, all the air was let go.
There are adjustment solenoids on the body but you need someone qualified to repair this.
first i would look under the rear of the car and you will see a ride sensor with a little arm
this tells the pump when to run either the arm broke came out of adjustment or the sensor is bad.
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