It's in the trunk, drivers side behind the side panel
I have a '94 and it is about 80 PSI. I imagine the '98 is similar.
The compresser is behind the passenger side wheel well liner.
In the trunk there is a trap door on the drivers side with the on off button.
press the reset button
If you mean the Air suspension/EVO steering module. It's behind right hand cowl panel, above connector bracket.
does the 2003 navigator have separate station to put wiper fluid for the rear?
If you mean:Air suspension/EVO steering module Part #9c392 it's behind right hand cowl panel, above connector bracket.
Under the dash on the passenger side to the right of the glove box is a air suspension and fuel cut of switch. It will say which button each is for.
In the trunk, drivers side panel in front of the suspension switch
Drivers side inside the trunk a little door that you open and use the on off button.
Inside the trunk drivers side open the door on the side and use the on off button.
I don't know on 95 for sure but the 96 is right front corner behind headlamp ==new answer== same in the 94