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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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  • Cars & Trucks Master
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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

Posted on May 10, 2014

  • 2 more comments 
  • al bryson
    al bryson May 10, 2014

    Are these the valves attached to the air bags?

  • Bill Boyd May 10, 2014

    they should be in the air lines to the bags and connected by a lever /rod to the suspension so that variations in the nride height can be read so that the body can be maintained at ride height. They will probably be small and in the hose to the bag

  • al bryson
    al bryson May 29, 2014

    I changed the air height sensor and plan to change the air shocks and solenoid valves this weekend. The truck still sags intermittently when parked and even sometimes when driving. The compressor will inflate the system but I hear something blow off, once in a while while parked, then the truck sags, you can see it go down. This is frustrating and the Ford dealer wouldn't work on it saying it was the compressor and replacement was $2,500. for that only, go figure.

  • Bill Boyd May 30, 2014

    what you hear blow off may be a water trap valve(air drier) the discharges water from the compressed air. It may be a source of youir problem because if it is no sealing off properly once the water has been blown out ,it will leak all the air out.

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