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Thread: Disco 300Tdi air con diagnosis.

  1. 6th March 2020, 06:54 PM #1
    s4mmie_
    s4mmie_ is offline Fossicker
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    Disco 300Tdi air con diagnosis.

    Hi,

    The AC in my Disco 300Tdi has stopped working. I took some time today to try and find the problem, with not much luck...

    - AC switch seems fine,
    - AC fans are working,
    - AC clutch works when hot-wired straight from battery.

    When searching for the relays I found some melted wiring that I think could be related, but I'm not sure what this box is:

    20200306_160159.jpg
    20200306_160215.jpg

    Cheers!
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  2. 6th March 2020, 09:13 PM #2
    s4mmie_
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    Never mind about the black box; it seems its an aftermarket Steelmate central locking unit...


    Any ideas where to look next for the air-con?
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  3. 6th March 2020, 10:20 PM #3
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    roverrescue
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    From memory (and it’s been a while)
    The circuit is pretty simple

    Switch on dash - AC pressure switch - coolant temperature switch - clutch of compressor

    When above all live - fans also get power.

    Is there 12V at the clutch when switch depressed
    First check is there pressure in the AC system
    Then check the continuity of the AC pressure switch and coolant temp switch

    S
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    '10 130 dual cab fender (getting to know it's neurons)
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  4. 8th March 2020, 07:39 AM #4
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    onebob
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    Disco 300Tdi air con diagnosis.

    Quote Originally Posted by roverrescue View Post
    From memory (and it’s been a while)
    The circuit is pretty simple

    Switch on dash - AC pressure switch - coolant temperature switch - clutch of compressor

    When above all live - fans also get power.

    Is there 12V at the clutch when switch depressed
    First check is there pressure in the AC system
    Then check the continuity of the AC pressure switch and coolant temp switch

    S
    ...... look for chaffed loom and wires near the compressor - that was the cause of my aircon failing recently.
    LROCV member #131
    1999 build D2 TD5 Auto, Mantec snorkel, 2" LRA spring lift, ARB on board air, Ashcroft ATB, CMM air ram CDL shifter, swag & gold pans ....
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