If your not too familiar with air-suspension, send it in. But I can tell you that the air-compressor will not last too much longer if it runs constantly.
You need to go underneath and find out where the air is coming from while the compressor is running. It is possibly coming from a defective proportioning valve, bad air-line or defective air-bag.
WOW! Sounds like you have your hands full of problems. You may want to try and avoid all of the air problems all together and check out Strutmasters.com. My mom had a 2001 Navigator and it sounds like the same issue. I bought her a four wheel kit for under half what the mechanic was going to charge me for the front.
They sure saved me time, money and headaches. I would recommend them to anyone in this position.
One of your rear air suspension components has failed releasing the air that you heard as a gasp. The optional air suspension on this vehicle uses air filled type springs instead of just conventional steel coil springs to support the rear suspension and with a loss of air pressure the rear of the vehicle will sag or drop considerably and the compressor will run and run as it tries in vain to refill the system. Usually one of the air springs fails but it could also be one of the air lines that go to them. Not something you can fix in your garage unless you are a very mechanically minded so I would suggest having it hauled to your local mechanic or Ford dealership for repairs.
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So you pretty much already know where the problem is. You know the system that needs work
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