Check fuel sensor in fuel tank first to see if this is causing the problem. Some cars you can get to it from your trunk and most cars have to drop the fuel tank.
SOURCE: 2001 lincoln navigator rear suspension?
Here is how to tell if system is working.Get into the vehicle and close door. Set ignition switch to on position and move the gear shifter to neutral. After a few secs. you should hear the compressor turn on. If it comes on then put shifter back to park leave ignition on and exit vehicle. Compressor will stop when you open the door but should start back up in a couple of secs. after you close the door. You can then walk around the vehicle and listen for leaks.
If compressor does not come on there are 3 fuses and a solid state relay that controls it along with the module.
The 3 fuses are no. 109(50amp) in the battery junction box under hood.This is the direct feed to compressor thru the solid state relay. The other 2 fuses are located in the interior fuse panel and they are no. 6 (5amp) and no. 12(15amp).
What we usually see though if compressor does not run is either a bad compressor or the solid state relay. They both are rather expensive so I would have an experience tech look at it then.
However If you feel confident enough and have a voltmeter or test light respond back and I will tell you which wires to check.
SOURCE: I have a 2001 lincoln Navigator The overdrive kept flashing
one question at a time, the OD flashes to let u know that the transmission control module has detected a fault in the trans, this is useualy slipping, u may not even feel it. Have it tested for trouble codes.
As for the AC, is the system fully charged, does the compressor run?
SOURCE: 2005 Lincoln Navigator. Message says to Check
Most likely the problem you are experiencing with the park assist is a fault in one of the sensors mounted in the rear bumper. I would not consider it to be a major fix, however there will be a few hours labor involved as the bumper cover needs to be removed to replace the sensors.
SOURCE: my 1998 navigator 4 wheel drive got stuck& now ac wont work
2 different electrical circut's that are unrelated. Ac on a 12 year old truck is bound to need some service. Take it to a trusted shop that is not hurting for work & ask them if anything is disconnected, ie: compressor power wire, high pressure switch...ect. Tell tale sign system is low on freon is the compressor keeps cycling on & off with a clicking sound or compressor does not come on at all.
Testimonial: "Thanks that relieves my mind that they might have disconnected something accidently. "
SOURCE: how do you replace fuel pump in lincoln navigator
Fuel Pump Module
Removal & Installation
To Remove:
WARNING
Highly flammable mixtures are always present in any fuel related component. Smoking or carrying lighted tobacco or an open flame of any type may ignite the flammable mixtures.
WARNING
Even when the engine is not running, fuel in the fuel system remains under high pressure. Fuel system pressure must be relieved before working on or disconnecting any of the fuel lines, fuel tubes, or fuel system components. Failure to do so may result in accidental spraying of fuel, personal injury, or a fire hazard.
To Install: 
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