The 2003-2006 Lincoln Navigator is built with the following suspension components:
2003-2006 Lincoln Navigator Air Struts (x4) - Metal tubes filled with gas-charged hydraulic fluid that dampens vibration and controls bouncing motions caused by travel on rough road surfaces. On this vehicle, the strut has a perch for a rubber air spring that takes fills with pressurized air to help support the weight of the vehicle. The rubber air spring takes the place of a traditional steel coil spring. Since all air springs and struts go bad at about the same rate, if one is failing, the others will not be far behind. For a proper repair, all of them need to be replaced at the same time.
2003-2006 Lincoln Navigator Air Lines- Tubes that carry pressurized air from an onboard compressor to the air struts.
2003-2006 Lincoln Navigator Compressor- This vehicle is equipped with an onboard air compressor that creates air pressure needed for the system to work. Leaks in the system, most commonly in the rubber portion of the air springs themselves, cause the compressor to get overworked trying to keep full pressure. The air compressor is forced to run continuously and after a couple of days of running non-stop, the compressor will burn itself out.
It may turn back on when given time to cool off, but it has been permanently damaged and will no longer be able to make enough air to inflate the system.
Replacing the compressor is a time consuming and expensive project.
2003-2006 Lincoln Navigator Dryer Assembly- This vehicle is equipped with a dryer assembly. The dryer assembly is responsible for getting moisture out of the air lines. Once the air suspension parts start to leak, moisture will build up throughout the air system. Moisture damages the air suspension components from the inside out. The dryer must be replaced whenever the compressor is replaced to prevent further damage.
2003-2006 Lincoln Navigator Suspension Control Module- This vehicle is equipped with a computer known as the suspension control module. This module is the brain of the suspension system and it reads all of the signals that are being sent by the height sensors and determines if the vehicle needs to be raised or lowered.
2003-2006 Lincoln Navigator 4WD Rubber O-rings- Although they are the least expensive parts of the air suspension, they are responsible for maintaining the seal where all of the air lines connect. Be sure to replace the O-rings when repairing any air suspension system.