Re: 2003 Navigator - Suspension Suddenly Stopped.
You can check the air compressor for continuity. If it doesn't check out then replace it. Electric air compressors do have a life span. I'd also get the system checked for a possible leak, which can lead to premature compressor failure as the compressor has to work harder to keep the air pressure up. If you have a means to get under the vehicle you can check for this yourself. First, get a new compressor and bring the air pressure up. Shut the vehicle off and get underneath with a spray bottle filled with a cup or so of pink/red hand soap. Spray all the air line joints and fittings and watch and listen for small bubbles or any signs of an air leak.
I don't recommend driving without the air suspension bags inflated, as you can tear the bags increasing the repair bill. You may get lucky and find a compressor at a salvage yard, or check out Ebay or other online stores before purchasing one at a premium price at the dealer.
'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!