Question about 2000 Ford Expedition

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My air suspension deflates often

The dealer wants to replace it. I think it is just a sticky valve.

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  • Anonymous May 10, 2009

    My 2000 Expediton suspension also occasionally deflates. If the problem was a leaking air bag, would not the compressor be running all the time trying to keep height adjusted? With out any knowlege, I was leaning toward replacing the module of height sensor but hate just to throw parts at the problem.

  • yadayada
    yadayada May 11, 2010

    I almost every case I have seen the problem is a leaky airbag, this is especially true if the truck is nearing 100,000 miles

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  • 6,784 Answers

Hi, im sensing a fault in the bag itself. sticky valves make noise. i would check the valve but, im sure its the bag itself.

Posted on Feb 20, 2009

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2 Answers

Self leveling suspension rear is deflated what do i have to do to make it come up


make sure you have air being pumped to that side air bag ,also check leveling valve on that side that determins if air is put in or let out, make sure pump is working at all, disconnect lines to check for air being pumped ,BE CAREFULL bags my deflate causing car to lower , check fuses for suspension control . I hope this helped .
Woody

Aug 28, 2014 | 1998 Lincoln Continental

1 Answer

Air suspension will not deflate


You need to find someone with a scan tool that can access the air suspension and manually cycle the individual springs to restore level. As a word of advise, turn the air suspension switch off, before you hoist the vehicle. This will prevent the compressor from inadvertently filling the air springs.

Nov 30, 2013 | Ford Cars & Trucks

2 Answers

Why won't rear end raise up ?


I have a 2000 Lincoln Town car, had the same problem, it was the rear air suspension/shocks. They are air bags basically that levels your car and it cost about $300.00 for each at the dealer for parts and install but it also has its own motor that inflates and deflates these air bags and I also had to replace that and that cost over $400.00 installed at the dealer.

May 28, 2012 | 2000 Lincoln Town Car

1 Answer

My Lincoln Navigator air suspension went flat after we replaced all four tires, it won't air back up...please help!!!


AIR COIL SPRINGS WILL DEFLATE AND BE DAMAGED IF YOU DID NOT TURN OFF AIR SUSPENSION SYSTEM BEFORE RAISING VECHICLE AND CHANGE TIRES IF YOU DONT TURN OFF AIR SUSPENSION IT WILL CAUSE AIR SPRINGS TO OVER INFLATE CAUSE AIR SPRING SPRING DAMAGE.

Oct 16, 2011 | 2004 Lincoln Navigator

2 Answers

My rear air bags are too high and will not deflate. The sensor is connectod ok on the rear arm. How can I deflate it manually. It is on a 1994 mark VIII


you can remove the rear lines at the air bags to deflate. most likely the problem is the air suspension control module is not turning the venting valve on to release the air from the bags.

Aug 10, 2011 | Lincoln Mark VIII Cars & Trucks

1 Answer

All 4 air suspension bags are deflated. what


leaks in all the bags and a bad ompressor or power relay.

Feb 28, 2010 | 2003 Lincoln Navigator

2 Answers

My licoln navigator front suspension is not working..stays deflated


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.

Dec 13, 2009 | 2004 Lincoln Navigator

1 Answer

Airride suspension won't deflate only inflate


It will only process a "down command" if it thinks all the doors are closed. If you have a bad door switch, it won't lower. Any courtesy lights on with doors closed?
The dealer can conduct a diagnostic scan test and retrieve any codes that will help identify the bad circuit. Did they do that?

Do you have 4 wheel air suspension or just rear?

Assuming rear only:
The system consists of unique rear air springs, the air compressor, air lines, air spring solenoids, height sensor, air suspension control module, attachments and associated signals derived from both driver and road inputs. With these components and signals, the air suspension control module commands changes in vehicle height that are necessary for the load leveling features.
The load leveling feature rear air suspension (RAS) systems shall automatically make adjustments in vehicle height so that the vehicle is always at trim height and constant front-to-rear vehicle attitudes are maintained over the expected load range of the vehicle. Adjustments in height that are necessary to correct height differences between the vehicle's left and right sides for the RAS system shall be restricted to what can be reliably achieved with one air suspension height sensor.
The system uses one air suspension height sensor, a steering sensor, generic electronic module (GEM) and other vehicle sensors to measure driver and road inputs. The system changes vehicle height using an air compressor, two air lines and the use of air springs with air spring solenoids.

Note this section.
The air suspension system holds vehicle height when the rear hatch or any door is opened. The system stores rear vehicle height the moment any open door is detected. The system then maintains this height regardless of the addition or removal of a load. The system will return to its commanded height when all doors are closed or the vehicle speed exceeds 16 km/h (10 mph).

Air Suspension Switch
The air suspension switch supplies power to the air suspension control module. Without the air suspension control module receiving this power, the load leveling system is inoperative and will not react when the rear of the vehicle is raised or lowered. If the air suspension system is disabled by turning off the air suspension switch, a "CHECK SUSP" will appear in the RH corner of the instrument cluster with the ignition in the run position.
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The vent solenoid:
  • allows air to escape from the system during venting actions.
  • is part of the air compressor cylinder head.
  • has a 1,103 kPa (160 psi) internal relief valve.
  • shares a common electrical connector with the air compressor motor.
  • is enclosed in the cylinder head casting, which forms an integral valve housing that allows the valve tip to enter the pressurized side of the system.
  • has an O-ring seal that prevents air leakage past the valve tip.
  • opens when the air suspension control module determines lowering is required.
  • provides an escape route for pressurized air that opens when system pressures exceed safe operating levels.
  • is replaced with the air compressor as a unit.
---------------------------------------------------------------
Air Suspension Height Sensor
One air suspension height sensor is mounted on the vehicle. The air suspension height sensor sends a voltage signal to the air suspension control module. The output ranges from approximately 4.75 volts at minimum height (when the vehicle is low or in full jounce), to 0.25 volts at maximum height (when the vehicle is high or in full rebound). The air suspension height sensor has a useable range of 80 mm (3.2 in) compared to total suspension travel of 200-250 mm (8 to 10 in) at the wheel. Therefore, the air suspension height sensor is mounted to the suspension at a point where full rear suspension travel at the wheel is relative to 80 mm (3.2 in) of travel at the air suspension height sensor. The air suspension height sensor is attached between the No. 5 frame crossmember (upper socket) and the panhard rod (lower socket).
When the air suspension height sensor indicates that the rear of the vehicle is lower than trim under normal driving conditions, the air compressor will turn on and pump compressed air to the air springs. When the sensor indicates that the rear of the vehicle is raised above trim under normal driving conditions, this will cause the air to be vented from the air springs to lower the vehicle back to its trim height level.
Compressor Relay
The compressor relay is energized by the air suspension control module to allow high current to flow from the battery to the compressor motor.
  • A solid state relay is used in the air suspension system for air compressor control. The relay incorporates a custom power metal oxide semi-conductor field effect transistor (MOSFET) and ceramic hybrid circuitry. The relay switches high current loads in response to low power signals and is controlled by the logic of the air suspension control module.
Air Suspension Control Module
NOTE: The 4WAS air suspension control module is used for the RAS system. The internal processor recognizes external circuitry to determine if it is installed in a 4WAS or a RAS equipped vehicle.
NOTE: The air suspension control module is calibrated with information from the air suspension height sensor. A new or exchanged air suspension control module requires a ride height adjustment calibration process to be performed.
The air suspension control module controls the air compressor motor (through a solid state relay), and the air spring solenoids. The air suspension control module also provides power to the air suspension height sensor. The air suspension control module controls vehicle height adjustments by monitoring the air suspension height sensor, vehicle speed, a steering sensor, acceleration input, the door ajar signal, transfer case signals, and the brake pedal position (BPP) switch. The air suspension control module also conducts all fail-safe and diagnostic strategies and contains self-test and communication software for testing the vehicle and related components.
The air suspension control module monitors and controls the air suspension system through a 32-pin two-way connector. The air suspension control module is keyed so that the air suspension control module cannot be plugged into an incorrect harness. There are two sides of the harness connection to the air suspension control module. Each is uniquely colored and keyed to prevent reversing the connections.
---------------------------------------------------
May be a bad module too.

Apr 11, 2009 | 2000 Lincoln Navigator

1 Answer

My airride on 2000 lincoln navigator will inflate but not deflate


MY 2000 LINCOLN CONT INFLATED A MONTH AGO AND WILL NOT DEFLATE. THE LIGHT COMES ON SAYING CHECK AIR RIDE SYSTEMS. HOW DO I DEFLATE?

Apr 11, 2009 | 1999 Lincoln Navigator

1 Answer

1997 expedition 2 wheel drive air suspension problem


There are ride height sensors in the rear that send a signal to the ride height/load leveling control module, one of these ,may be defective. Have Ford dealer run an active test of the system, they will find out what the part is that has failed, otherwise you are guessing, that equals wasted $$$

Nov 04, 2008 | 2000 Ford Expedition

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