98 pete 3406e engine fan wont turn on for temperature

Discussion in 'Peterbilt Forum' started by Junk Yard Dogg, Jun 21, 2013.

  1. Junk Yard Dogg

    Junk Yard Dogg Bobtail Member

    24
    4
    Jun 21, 2013
    winnipeg manitoba canada
    0
    98 pete with a 3406e, the engine fan won't come for temperature cool down. Fan works with manual switch in cab and fan comes on for the a/c, but will NOT come on for overheating.
    I ground tested the fan stat wire but still no fan activation.

    please help
     
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  3. Pinner

    Pinner Medium Load Member

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    201
    Feb 14, 2010
    B.C.
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    Pretty obvious a sensor isn't working. Are you actually overheating ? Getting derated ? Blowing antifreeze ?
     
  4. sucksqeezebangblow

    sucksqeezebangblow Bobtail Member

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    Jun 22, 2013
    0
    I agree with Pinner, The sensor is probably reading its just stuck in-range and it is not reading when the temperature gets to the fan on mode. If it was a wiring issue it would throw a check engine light on. Change out the sensor and try from there, its the two wire sensor located on the bottom of the termostat housing.

    Good luck!
     
    Junk Yard Dogg Thanks this.
  5. Pinner

    Pinner Medium Load Member

    410
    201
    Feb 14, 2010
    B.C.
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    I want to know if the engine is actually overheating. Some people just worry too much.
     
  6. manasteel

    manasteel Light Load Member

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    Sep 10, 2012
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    If you unplug the sensor in the thermostat housing it will set the ecm to a default temp of 194 deg and turn the fan on. If so you may have an issue with the temp sensor its self
     
    Junk Yard Dogg Thanks this.
  7. Junk Yard Dogg

    Junk Yard Dogg Bobtail Member

    24
    4
    Jun 21, 2013
    winnipeg manitoba canada
    0
    Thanks guys I was checking the wrong sensor, I was checking the top sensor. I will check tomorrow and report.
     
  8. Junk Yard Dogg

    Junk Yard Dogg Bobtail Member

    24
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    Jun 21, 2013
    winnipeg manitoba canada
    0
    I was getting warning lights for over temp.
     
  9. booboo

    booboo Bobtail Member

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    Jan 17, 2009
    gainesville,ga
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    Junk yard dog, youve got a pm.
     
  10. Junk Yard Dogg

    Junk Yard Dogg Bobtail Member

    24
    4
    Jun 21, 2013
    winnipeg manitoba canada
    0
    ok I don't have a 2 wire sensor. In my thermostat housing I have a alarm stat,temp sender for the temp gauge and coolant temp sensor. Peterbilt couldn't or wouldn't tell me if the ECM controls the fan solenoid in a 98 c-12. They said it might be controlled by the coolant temp sensor, the 3 wire probe.
     
    Last edited: Jun 26, 2013
  11. manasteel

    manasteel Light Load Member

    124
    32
    Sep 10, 2012
    0
    what is the engine prefix ? ya know like 2ks or ?
     
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