Cat 15 engine fan won’t turn off parts replaced

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Semidumper, May 12, 2021.

  1. Semidumper

    Semidumper Bobtail Member

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    Nov 8, 2019
    0
    I got a 2007 Freightliner Columbia with a cat 15 engine I changed the fan clutch and it was working for about 2 days on and off then it stopped I changed the selenoid also and the high ac pressure switch still nothing fan runs all day

    I will Try to change the low pressure switch also

    any suggestions ?
     
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  3. MM71

    MM71 Medium Load Member

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    621
    Jun 28, 2008
    AZ
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    probably a broken wire in the harness .... my guess is ground wire for the high pressure swtich. A shop with Cat ET should be able to tell you what is kicking on your fan.
     
    Goodysnap Thanks this.
  4. ClineER

    ClineER Light Load Member

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    135
    Apr 27, 2016
    N.E. Oklahoma
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    Most times I run into that is high pressure switch connector. Sounds like you already changed the costly stuff.
     
  5. rollin coal

    rollin coal Road Train Member

    10,900
    17,194
    Mar 29, 2008
    TN
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    Could be the jumper harness to the high pressure a/c switch is not making a good connection. Had this same problem before and a new harness fixed it.
     
  6. Shawn19

    Shawn19 Light Load Member

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    26
    Apr 20, 2019
    0
    Could be your lossing air if the fan not getting air it will run all the time i had the same problem the airline that goes to the fan put your hand an follows it to find air leaks it had to find cause the engine has to be running.
     
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