I was getting the "Check

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

you have a leak in the airbags, you can get new ones or you can get the airbags replaced with springs which i recommend so you never have another suspension problem again.

If I'm understanding the question correctly, the problem is the rear is stuck in the "jacked up" position. If you start the car and after a short while the check suspension message comes on, most likely the problem is a rusted corroded vent solenoid in the compressor. When this solenoid sticks closed, the air can't vent to the atmosphere. Keep in mind this problem is a very common one and the root cause is excessive moisture in the system. While replacing the compressor/dryer would get it working normally again, if the moisture problem isn't addressed, the replacement compressor WILL BE short lived as well. RECAP: Short term....replace the compressor/dryer. Long Term....replace the compressor/dryer, then in 30 days replace the dryer only....then again in 6 months. Want to be done it those problems forever? Do a Lincoln Town Car Air Suspension Conversion on your car and be done with those expensive repairs forever!......for less than the cost of a replacement compressor.

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

that should not happen. Did you turn the switch off in the back for the suspension? Did you do something else at the same time, like check the spare tire for air pressure?

I have info on 2003 navigator 4 wheel air suspension. Maybe similar

SECTION 204-05: Vehicle Dynamic Suspension — 4-Wheel 2003 Expedition/Navigator Workshop Manual
DESCRIPTION AND OPERATION Vehicle Dynamic Suspension The four wheel air suspension system is comprised of the following components:

• service switch
• control module
• two front height sensors
• one rear height sensor
• compressor and drier assembly (includes vent solenoid)
• air lines
• front and rear air spring and shock absorber assemblies
• four air spring solenoids

WARNING: The service switch for the air suspension system must be shut off prior to hoisting, jacking or towing an air suspension vehicle. This can be accomplished by turning off the air suspension switch located in the jack storage area in the rear of the passenger compartment. Failure to do so may result in unexpected inflation or deflation of the air springs which may result in shifting of the vehicle during these operations.

WARNING: Do not remove an air spring under any circumstances when there is pressure in the air spring. Do not remove any components supporting an air spring without either exhausting the air or providing support for the air spring to prevent vehicle damage or personal injury.
Air Suspension Pneumatic Diagram
Item Part Number Description 1 5319 Air compressor and drier 2 5B322 Air line T-fitting 3 5B321 Air line union 4 — Air line Y-fitting 5 18945/5311 Air spring and solenoid
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Principles of Operation
The 4-wheel air suspension (4WAS) module commands changes in vehicle height that are necessary for both the load leveling and the vertical height adjustment features.
The 4WAS load leveling feature automatically makes adjustments in vehicle height so that the vehicle is always at trim height, and that constant front-to-rear vehicle attitudes are maintained over the load range of the vehicle. Adjustments in height that are necessary to correct height differences between the vehicle left and right sides for the 4WAS system are restricted to what can be reliably achieved with three height sensors.
The height adjustment feature has three vehicle heights within a two-inch span:
Kneel height — improves the ease of entering and exiting by lowering the vehicle one inch below the trim height in the front and rear when the vehicle ignition is in the OFF or LOCK positions and the vehicle is stationary.
Trim height — normal vehicle ride position; vehicle moves to trim position when the ignition is ON, when the transmission is initially shifted to DRIVE or REVERSE mode, when all doors are closed or when speed of more than 24 km/h (15 mph) is detected.
Off-road height — improves ground clearance by raising the vehicle one inch above trim height in the front and rear when the vehicle is at 4x4 low modes and the vehicle speed is less than 40 km/h (25 mph).
The 4WAS module uses the universal bus protocol, (UBP), module communications network for sending and receiving various signals with the exception of speed, information from the three height sensors, and the air suspension service switch. For additional information about UBP, refer to Section 418-00 .
The 4WAS system holds vehicle height when any door or rear hatch is opened. The system stores front and rear vehicle height the moment any door is detected open. The system then maintains this height regardless of the addition or removal of a load. The system returns to its commanded height when all doors are closed or vehicle speed exceeds 24 km/h (15 mph).

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Air Suspension Service Switch
The air suspension service switch signal is needed to wake up the 4WAS module. Without the module receiving this signal, the 4WAS system is inoperative at speeds below 24 km/h (15 mph) and will not react when the vehicle is raised or lowered. At speeds above 24 km/h (15 mph), the system will be active as if the air suspension service switch is in the ON position.
Vehicles without message center When the air suspension service switch is in the OFF position and the ignition switch is in the RUN position, a "CHECK SUSP" will appear in the RH corner of the instrument cluster.
Vehicles with message center When the air suspension service switch is in the OFF position and the ignition switch is in the RUN position, the message center will display "SUSPENSION SWITCHED OFF"
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Inspection and Verification

1. Verify the customer concern.

1. NOTE: If the door ajar indicator is illuminated when all doors, liftgate, and liftgate glass are closed, the air suspension will not work correctly. Repair door ajar indicator; refer to Section 413-01 .
   Visually inspect for obvious signs of mechanical and electrical damage.

Visual Inspection Chart Mechanical Electrical

• Restricted suspension movement
• Excessive vehicle load
• Cut, severed, crimped air line(s)
• Unmounted height sensor(s)
• Damaged front air spring(s)
• Damaged rear air spring(s)

• Battery junction box (BJB) fuses 20 (30A), fuse 27 (5A), and fuse 111 (50A)
• Loose, corroded, or disconnected connectors
• Air suspension service switch is in the OFF position
• Damaged solenoid valve(s)

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I fthis does not help, the dealer can hook up his diagnostic equipment and download fault codes. Good luck. Please give best rating if this helps.

the compressor is mounted down low in the left front behind the left headlight. it is powered by a large fuse in the under hood right side fuse panel. if the fuse is good.flip off the trunk suspension switch,jack up the rear wheels and check to see if the sencing arm that attaches to the rear end has fallen off it's pivot. if it is unattached it will drop both rear air bag pressures quickly.
good luck chris

yes. try this website they have replacement parts.
Suncore industries dot com

There is one at each wheel. here is some info

Vehicle Dynamic Suspension The four wheel air suspension system is comprised of the following components:

• service switch
• control module
• two front height sensors
• one rear height sensor
• compressor and drier assembly (includes vent solenoid)
• air lines
• front and rear air spring and shock absorber assemblies
• four air spring solenoids

WARNING: The service switch for the air suspension system must be shut off prior to hoisting, jacking or towing an air suspension vehicle. This can be accomplished by turning off the air suspension switch located in the jack storage area in the rear of the passenger compartment. Failure to do so may result in unexpected inflation or deflation of the air springs which may result in shifting of the vehicle during these operations.
WARNING: Do not remove an air spring under any circumstances when there is pressure in the air spring. Do not remove any components supporting an air spring without either exhausting the air or providing support for the air spring to prevent vehicle damage or personal injury.
Air Suspension Pneumatic Diagram
Item Part Number Description 1 5319 Air compressor and drier 2 5B322 Air line T-fitting 3 5B321 Air line union 4 — Air line Y-fitting 5 18945/5311 Air spring and solenoid

Suspension Height Sensor Removal and Installation
NOTE: Front shown, rear similar

1. WARNING: The electrical power to the air suspension system must be shut off prior to hoisting, jacking or towing an air suspension vehicle. This can be accomplished by turning off the air suspension switch located in the LH quarter trim panel. Failure to do so may result in unexpected inflation or deflation of the air springs which may result in shifting of the vehicle during these operations.
   Raise and support the vehicle. For additional information, refer to Section 100-02 .

1. Disconnect the sensor arm.

3. Remove the bolts and the sensor.
4.

1. Disconnect the electrical connector.

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Ride Height Adjustments
Special Tool(s) Worldwide Diagnostic System (WDS)
418-F224

New Generation STAR (NGS) Tester
418-F052 or equivalent scan tool
Inflation and Deflation of the Air Suspension System

1. NOTE: Make sure that the air suspension switch is in the ON position
   NOTE: Make sure that a battery voltage of at least 11 volts is maintained while carrying out this procedure.
   Turn the ignition switch to the ON position.

1. Connect scan tool to the data link connector (DLC).

1. Select Air Suspension Control Module under Active Command Mode:
   • VENT FRNT to deflate the front down.
   • LIFT FRNT to inflate the front up.
   • VENT REAR to deflate the rear down.
   • LIFT REAR to inflate the rear up.

Calibration
Ride Height Resetting

1. NOTE: Make sure that the air suspension switch is in the ON position
   NOTE: Make sure that a battery voltage of at least 11 volts is maintained while carrying out this procedure.
   Turn the ignition to the ON position.
   • Exit the vehicle, close all doors and allow the system to vent the vehicle down to kneel height (approximately 45 seconds).

1. With the ignition remaining in the ON position, shift the vehicle into DRIVE and then back to PARK.
   • Exit the vehicle, close all doors and allow the vehicle to pump to trim (approximately 45 seconds).

1. Measure the ride height. For additional information, refer to Section 204-00 .

1. Open the LF door.

1. Connect scan tool to the data link connector (DLC).

1. While outside of the vehicle, select the proper vehicle year, model and engine type.

1. Select 4WAS module.

1. Using the active command mode, vent or lift the vehicle to achieve the correct ride height.

1. Select the "Save Calibration Values (Store Ride Height)" scan tool command to calibrate the 4WAS module.

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If you are refering to your rear shocks you may just need the compressor pump, located under the hood on the left side. That pump may just be bad, especially if the car sit extremely low.

Check your Suspension relay under you front bumper on the passenger side most of the time it get loose or just corroded from the weather (snow , Water)... clean it up and put dielectric grease in it