07 Freightliner Century temp gauge going up and down

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by combo7, Jul 31, 2018.

  1. Jul 31, 2018 #1
    combo7

    combo7 Bobtail Member

    37
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    Jan 19, 2016
    Worcester MA
    0
    so the temp gauge started going up and down out of nowhere any ideas on the reason ?
     
    combo7, Jul 31, 2018
    combo7, Jul 31, 2018
    #1
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  3. Jul 31, 2018 #2
    Ol sparky

    Ol sparky Bobtail Member

    5
    1
    Aug 2, 2017
    0
    Short somewhere in wire
     
    Ol sparky, Jul 31, 2018
    Ol sparky, Jul 31, 2018
    #2
    combo7 Thanks this.
  4. Aug 1, 2018 #3
    DieselTech_Aus

    DieselTech_Aus Light Load Member

    274
    309
    Dec 20, 2017
    WA
    0
    freight liner use 1939/1587 data link from the ECM to the instrument cluster control. its a direct copy from the ECM sensor, unlike a Kenworth for example that has its own separate sensors for the dash and the OEM engine sensors for the ECM.

    likely your engine temp sensor (cat, cummins or Detroit) or the harness is faulting.
    get it checked ASAP to ensure you don't have a blocked radiator or U/S thermostats causing the fluctuation.
     
    DieselTech_Aus, Aug 1, 2018
    DieselTech_Aus, Aug 1, 2018
    #3
    FdEF Thanks this.
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