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Thread: Suspension compressor fault

  1. #1
    Join Date
    May 2012
    Location
    Newport Victoria 3015
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    Suspension compressor fault

    My L322 had a dashboard fault indicating:
    "Air Suspension Inoperative"
    Although the fault came straight back after clearing with Faultmate the car travelled Queensland to Victoria with normal ride height.

    The FAULMATE indicated the following"

    "Compressor temperature rises when compressor inactive (Current, intermittent)"
    "Compressor temperature sensor fault (intermittent)"


    I pulled the compressor then removed the sensor from pocket in cylinder head.
    I had wear in the spot where locating bolt contacted, I filed that smooth, cleaned sensor and pocket with contact cleaner, reassembled and so far no fault coming up.
    Given that the sensor is not available as a spare this may be of interest.
    I did also fit a new piston ring while compressor was out as I had one on hand but that was simply for preventive maintenance.


  2. #2
    Join Date
    Dec 2010
    Location
    Mirboo North Victoria
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    It is strange the fault indicates sensor heating up when compressor is inactive as compressors generate heat during normal operation its the principal Diesel engines operate on, you fixed your problem when you replaced the compressor seal. By changing the seal you reduced the pressure loss and reduced the time the compressor runs to reach the desired pressure thus less heat generated during normal operating cycle. I am sure you remember pumping up a bike tyre and the pump getting hot in your hand as a kid same thing. Anyhow you fixed it that’s the main thing.
    Gippy

  3. #3
    Join Date
    May 2012
    Location
    Newport Victoria 3015
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    Quote Originally Posted by Gippslander View Post
    It is strange the fault indicates sensor heating up when compressor is inactive as compressors generate heat during normal operation its the principal Diesel engines operate on, you fixed your problem when you replaced the compressor seal. By changing the seal you reduced the pressure loss and reduced the time the compressor runs to reach the desired pressure thus less heat generated during normal operating cycle. I am sure you remember pumping up a bike tyre and the pump getting hot in your hand as a kid same thing. Anyhow you fixed it that’s the main thing.
    Gippy
    Gippslander:

    whist I appreciate your contribution I beg to disagree and wrote a lengthy reply which I then decided against posting.
    i am a qualified diesel mechanic who has owned this car since new, understand my FAULTMATE and different codes.

    i have rebuilt compressor previously due to wear in piston ring (twice)

  4. #4
    Join Date
    Dec 2010
    Location
    Mirboo North Victoria
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    I did not intend my post to be condescending and when read again I can see it may have appeared so, I was just trying to say I had similar faults on my car but it was after the compressor had been running excessively. This was due to both a leak and a worn piston seal once the leak was fixed and the seal replaced the fault did not register again.
    i say again it was not my intent to lecture but say I had a similar experience and how I resolved it.
    Regards Gippy

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