I have a 2001 Lincoln Navigator with Air suspension problem. I replaced the air compressor, both rear air bags, checked the air suspension switch in the passenger side kick panel. Now I am trying to locate and check the relay as I still do not have power to the new compressor?

A technician or mechanic can check this, but the most common problems are:
1) An electrical failure of some part, for example the switch or the relay that activates the compressor, or
2) the compressor itself could have failed.
God bless your efforts.

These Lincoln air suspensions are terrible. I have converted many over to coil springs at a fraction of the cost of replacing/repairing the bags. If the rear bags don't inflate, there is a broken air line to the bags or the bags are leaking

The air bags are leaking, replace them as a pair.

Usually between the frame and the rear axles. A lever type device, should be fairly easy to locate. Check that the compressor is building air pressure and storage tank. Air bags not leaking and etc.

could just be a seal on the air line itself, or possibly a whole in the line or one of th eleveling air bags. gong thru the water should'nt have any effect on it,unfortunately these are just like any other part, or seal they just eventually wear out.

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Lincoln Navigator 1997 2002 WorkSHOP Service repair manual Download

It sounds like one of your air bags could have blown. I would check them first. I would also suggest checking into a replacement non air conversion kit from Strutmasters. I replaced the air system on my 2002 Navigator and saved a lot of time, money and headaches.The lines on my navigator had holes in them and I replaced the compressor twice before I realized it. Very costly. Avoid all the hassle and check out Strutmasters.

the most common problem in this truckr and the Ford expidition is that the rear suspension air springs are leaking, they last about 75,000 miles, less on really rough roads.

First, you should have a warning light telling you it is not working. There is a switch for the air suspension underneath the glovebox-right hand side or in the rear hatch area on the left panel..make sure it's on. If all 4 air bags are deflated it could mean the air pump or actuator is malfunctioning.

you can replace the bags. with springs from a navigator that did not come with air ride. a salvage yard should help you out. good luck