Question about 1998 Lincoln Navigator

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Air bags will not fill, yet compressor is pumping.

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The air springs are leaking, this is common on trucks up around the 100,000 mile rangem replace them as pairs always, u can also eliminate the system they make kits that fit right in the suspension.

Posted on Jul 28, 2010

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Can I safely remove the AIRmatic compressor if all four wheels are on the ground?


I suspect that it is not the compressor as it is filling the system
I would be checking for non return valves in the system that is allowing the pumped air back to the compressor and not storing in the air bags or accumulator tank
to answer your question , the car should not sink down as the non-return valves should hold it in place but if you are concerned jack up the car and place it on jack stands so that the weight of the car is not on the air bags

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Can I bypass the air system to fill air manually


On the Mark VII, they came with an emergency fill schrader(like a tire valve) valve on the compressor head. To use this, simply apply compressed air to the Schrader valve WHILE THE PUMP IS RUNNING. The reason I say while the pump is on, is because if the compressor is on, the solenoids on the front or rear WILL be open, thus allowing air into the air spring(bag).
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air bags solenoid is stuck open releasing air this happens when you raise then lower car in normal working mode valve opens closes as need to maintain ride hight when car is jacked up it thinks the bags have been filled emtys bags when you lower car down to readjust height you need new bags and a new compressor it will burn up trying to fill fill fill when it cannot suncore industries around 370.00 for everthing 2 to 3 hrs to replace

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Problem most likely 1 of 2 things.
  1. Most common is bad air springs- they will fill up but fail to hold air. 1 symptom is you will hear the air compressor constantly pumping air to try to keep the spring inflated
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If the rear of the truck raises and settles back on the wheels after you turn the truck off then it's almost certain to be the air springs. Often referred to as air bags, they look like normal springs with the air bags inside.

If the rear of the truck doesn't raise at all, the line from the compressor is likely bad to the point that it won't fill the springs at all. If it turns out to be the springs, you should replace them in pairs since they often will go within months of each other. Another thing to consider is some Lincoln owners have opted to replace the air ride system with conventional springs.

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The rear of the car is low to the ground, could just one air bag be bad?


Usually these break in pairs because of the air compressor....but you may have one ruptured bag.

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2000 Expedition rear suspension randomly leaks and pumps up fine. Sometimes the compressor funs a lot. The bags have 150K on them, but don't look too bad, no metal showing.Leaks evenly. Can I replace the...


One of your rear bags has a pinhole in the rubber,therefore the pump is trying to compensate for the needed air.A easy was to diagnose a air leak in the system is to spray down the bags with glass cleaner and it will show you where the leak is.Id suggest that you replace the defective bag rather than convert it to standard suspension.

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If everything else is working, the compressor and the air bags are good, and the lines are ok, then you might have a bad leveling switch. That what actually controls the compressor.

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Sounds like the problem is in the air bag suspension, not the compressor. The air bags shouldn't be losing air when the car sits. The compressor adjusts the suspension level according to the load. The air bags have a valve similar to a blow up raft that allows air to pass through both ways. If when the car is running the compressor is constantly running and not turning off, the issue is within the air bags and/or the air line.

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the air lines or bags need to be replaced,check the lines at the pump

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