2001 ford expedition rear air suspension problems, 5.4 automatic,
The car sags only intermittently, the compressor re-inflates the bags but it will still sag when driving, but may maintain inflation while parked all day, could it be the valves, are there some sort of check valves to hold air in the bags? I have checked the bags and there are no leaks, what next?
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Re: 2001 ford expedition rear air suspension problems,...
Check the ride height air valves as I suspect that there may be a problem there . When parked the valves will be sealing off correctly but when in use as in driving the constant variations may be letting more air out than the valve will be letting in to maintain ride height
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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
If You are referring to the Air suspension System then You Have a Leak in the Line diverter Bell, It look like a bell with 5 r 6 1/4 in Plastic Lines coming out of it, try Spraying it With Soapy Water to see any air Bubbles, if this is the Case replace the Bell or the O-rings on the Lines, or both ,also Check the Lines going into the suspension Bags, If the Bags themselves Have any Cracks in them then You need to replace the Bags, Fairly Expensive, and Unless You are a Tech Dont try this @ Home since Major Bodily Injury can Occur, If Not following the Correct Procedure's to replace the Bag Suspension SYStem
With out seeing the vehicle, it is difficult to say. There are fuses that control the small compressor that inflates the bags, the wiring could be faulty. the compressor could be bad. The control switch could be bad, I am not sure what activates the compressor on that model, weather it is automatic load leveling or manual leveling with a switch inside the car. It might pay to get a manual such as haines for your perticular model. Sorry I couldnt be more helpful, but electricly controled systems like this are hard to trouble shoot without seeing them.
It sounds like one of your air bags could have blown. I would check them first. I would also suggest checking into a replacement non air conversion kit from Strutmasters. I replaced the air system on my 2002 Navigator and saved a lot of time, money and headaches.The lines on my navigator had holes in them and I replaced the compressor twice before I realized it. Very costly. Avoid all the hassle and check out Strutmasters.
There is a compressor underneath the car on the passenger side (RHD) which inflates two rubber suspension bags on the rear axle. This is controlled by the SLABS ECU and a pair of height sensors on the rear trailing arms. You probably have two failed bags, and may now also have a knackered compressor if it's not managing to inflate it due to it having been working overtime! Sometimes you can have issues due to the valve block inside the compressor housing also. Bags are ~ £100 each, height sensors are ~£35 each, valve block is iirc about £100-£200, and the compressor is £300-400. Bags/sensors can be DIY'd easily with the right tools.
IF YOU HEAR COMPRESSOR TURNING ON THATS GOOD. THE MOSE COMMON PROBLEM IS BEHIND BATTERY THERE IS A PLASTIC LINE WITH A UNION TO CONNECT THEM,THE UNION BREAKS AND BAGS WILL NOT INFLATE IN REAR. YOU CAN GET UNION AT A DEALERSHIP AND SIMPLE TO INSTALL THE LINES BACK TOGETHER,MAYBE ALSO A LEAK AT THE BAGS IF IT INFLATES AND SINKS AFTER SITTING A WHILE. WITHOUT MORE INFO THATS WHAT I HAVE TO OFFER.
the air suspension system is failing,check the suspension switch located behind the passengers side kick panel to see if its on,check the fuses,worst case a hole in the lines to the air bags or bad compressor.about the sunroof-not sure
look for creases with cracks in the air bags, if u have over 75,000 miles u can almost be sure the bag or bags are leaking. I am a Ford dealer technician and have very good knowledge of this problem, hardly ever see anything but defective leaking bags, and on occasion a disconnected load level sensor on the rear suspension, have u checked that?.
Sounds like the seals may have failed in the air shocks themselves. I also think you may have a bleeder valve problem. Follow the lines back and check the bleeder valve to see if it is leaking when you have someone else turn the vehicle on.