1999 lincoln navigator. had in shop few times for

When the key is off, the air suspension shouldn't lose any air, so you could have a valve leak in the system. I'm not familiar with all the components of the system, but did you check the valve that allows the system to bleed off pressure for leaks when the system is turned off?

That is not a question you ask on the internet,
& no one has any diagrams, unless they own the
same vehicle & have purchased factory manuals

You ask a dealer by giving the parts dept your
VIN #

If your converting from air to conventional suspension,
then you ask the parts suppliers that sell the new parts
your going to use to replace the air shocks/struts

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.

Fix your car right away by clicking the link I attached
Lincoln Navigator 1997 2002 WorkSHOP Service repair manual Download

Replace the entire Air Suspension with
conventional shock/struts such as Strutmasters
or other brands

You do not even diagnose a Navigators Air
Suspension after the vehicle is 5 years old
Dealers can't figure it out

Next time you get the Ford version.
Still issues but nowhere near anything
that is installed on a Navigator

A Navigator is like an Oldsmobile from
the 1970's & 1980's A test bed of poor choices,
bad engineering & ideas

those systems are junk and not really repairable, any repair cost will far exceed the value of the car and it will just start leaking again. take a look at www.strutmasters.com and consider buying one of their replacement suspensions for it. that will put an end to it once and for all.

You must have a leak or its not pumping air like it should. This happened to my dads Lincoln towncar back in the day.

You need a compressor that will put out 200 psi. Here is a new one on ebay for $212 http://cgi.ebay.com/ebaymotors/1998-1999-2000-Lincoln-Navigator-Air-Ride-Compressor-/230481832909?cmd=ViewItem&pt=Motors_Car_Truck_Parts_Accessories&hash=item35a9c9abcd#ht_1913wt_1167 Here is a used one for $119.50 http://cgi.ebay.com/ebaymotors/1998-1999-2000-LINCOLN-TOWN-CAR-AIR-RIDE-COMPRESSOR- /170491628713? cmd=ViewItem&pt=Motors_Car_Truck_Parts_Accessories&hash=item27b217cca9#ht_3365wt_941 Another option is to convert the system to springs and shocks. The conversion kit will cost $327. http://www.strutmasters.com/Lincoln-Town-Car-Air-Suspension-Conversion-Kit-p/-ltc-r2s-4.htm

your truck comes with suspension airbag for a smooth right..all lincoln naviagator come with it..if your take it the shop and they forget to disable that before they lift it up..most likely they blown the airbag for your suspension...those air suspension are rear spring for your truck

fixed a few of these,eleminate air bags and install coil springs,pricie but well worth it,never have that problem again