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Cooling fan C12 cat cuts in and out all the time when driving

Discussion in 'Canadian Truckers Forum' started by Blakden, Mar 29, 2019.

  1. Mar 29, 2019 #1
    Blakden

    Blakden Bobtail Member

    2
    0
    Mar 29, 2019
    0
    Has anyone had a problem with cooling fan kicking in and out all the time. Engine temp doesn’t get above 150. It’s in a FL115 tuck
     
    Blakden, Mar 29, 2019
    Blakden, Mar 29, 2019
    #1
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  3. Mar 29, 2019 #2
    Zeviander

    Zeviander Road Train Member

    4,887
    36,995
    Jan 23, 2015
    Winnipeg, MB, CA
    0
    Sounds like a thermostat problem.
     
    Zeviander, Mar 29, 2019
    Zeviander, Mar 29, 2019
    #2
  4. Mar 29, 2019 #3
    Expeditor

    Expeditor Medium Load Member

    451
    530
    Mar 5, 2018
    0
    Could be bad high pressure A/C switch. The weather is not hot enough to cause fan to come on from A/C, so a bad switch can cause the fan to come on.
     
    Expeditor, Mar 29, 2019
    Expeditor, Mar 29, 2019
    #3
    Cam Roberts and IH Truck Guy Thank this.
  5. Mar 29, 2019 #4
    stayinback

    stayinback Road Train Member

    3,911
    8,256
    Jan 24, 2014
    chicago,il
    0
    Yeah I did- How did I fix it?

    I did 3 things and not sure which 1 fixed it,But it worked.....

    1.Remove both ECM plugs,Clean them use contact cleaner,Check for broken wires then reinstall.
    2. You'll have a Black Air line going to the Fan Hub- Pull it off-Blow air in the Hub,Clip the Line for a Clean install,Then tap the hub a few times with a rubber hammer.
    3.coolant temp sensor- Unplug,Clean connector and pins in the sensor-Reinstall.

    I did those 3 things..And It Never came on again unless Im Pulling Big Hills.
     
    stayinback, Mar 29, 2019
    stayinback, Mar 29, 2019
    #4
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