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Fan running

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by EnglishMark, Jul 6, 2018.

  1. Jul 6, 2018 #1
    EnglishMark

    EnglishMark Light Load Member

    64
    15
    Feb 15, 2011
    orlando, Fl
    0
    Ok so I've had the truck at Detroit in Orlando 2 days (07 freightliner Columbia) I put a new solenoid on it (under expansion tank) didnt fix. Their computer says everything is good with ecm but no ground going to the solenoid. They put their own ecm on, fan still ran non stop. Wires have been checked going from solenoid to ecm no breaks. Everything on truck works fine AC works (cold) , no faults but fan wont quit running. They were stumped n said they may need to tear dash apart I dont have time for that so drove it home.
    Stumped ... any ideas?
     
    EnglishMark, Jul 6, 2018
    EnglishMark, Jul 6, 2018
    #1
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  3. Jul 7, 2018 #2
    EnglishMark

    EnglishMark Light Load Member

    64
    15
    Feb 15, 2011
    orlando, Fl
    0
    Nothing?
     
    EnglishMark, Jul 7, 2018
    EnglishMark, Jul 7, 2018
    #2
  4. Jul 7, 2018 #3
    ClineER

    ClineER Light Load Member

    229
    139
    Apr 27, 2016
    N.E. Oklahoma
    0
    What in ecm is trekking fan too run. Temp switch or a/c pressure or manual switch. Once you know which switch trace the circuit. I had one that did similar, was corroded pin on a/c pressure switch but nothing in computer for codes, but showed that switch as commanding fan on in ecm.
     
    ClineER, Jul 7, 2018
    ClineER, Jul 7, 2018
    #3
  5. Jul 7, 2018 #4
    Dave_in_AZ

    Dave_in_AZ Road Train Member

    59,638
    414,848
    May 4, 2015
    0
    What kind of engine? My ISX was stuck. it was the high pressure switch at the compressor. Three switches just with AC that do fan clutch. There is also, water temp, intake manifold temp, exhaust manifold temp, and one other that make the fan kick on with the ISX.
     
    Dave_in_AZ, Jul 7, 2018
    Dave_in_AZ, Jul 7, 2018
    #4
  7. Jul 8, 2018 #5
    EnglishMark

    EnglishMark Light Load Member

    64
    15
    Feb 15, 2011
    orlando, Fl
    0
    Thanks guys, I asked the tech at detroit if the ecm showed what was making fan run, he said nothing on his laptop was showing fan running:( guess I'll have to unplug EVERYTHING lol and check connections.... they seem to think something behind the dash is causing it to run... although they have no idea what. #fueleconomysucksrightnow
     
    EnglishMark, Jul 8, 2018
    EnglishMark, Jul 8, 2018
    #5
  8. Jul 8, 2018 #6
    Dave_in_AZ

    Dave_in_AZ Road Train Member

    59,638
    414,848
    May 4, 2015
    0
    All those switches are normally closed. So pull them one by one, and put a little jumper wire in the connector. That will tell you if it's a switch.
     
    Dave_in_AZ, Jul 8, 2018
    Dave_in_AZ, Jul 8, 2018
    #6
    EnglishMark Thanks this.
  9. Jul 16, 2018 #7
    KTM042974

    KTM042974 Bobtail Member

    8
    0
    Jul 16, 2018
    0
    Same problem on 379 with a C15!! Changed cam this weekend and now the fan won’t shut off. Would disconnecting the batteries for a long period reset something?
     
    KTM042974, Jul 16, 2018
    KTM042974, Jul 16, 2018
    #7
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