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2015 peterbilt 389 w/Cummings isx 15. Temp problems

Discussion in 'Peterbilt Forum' started by Turi 385, Oct 4, 2018.

  1. Oct 4, 2018 #1
    Turi 385

    Turi 385 Bobtail Member

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    Oct 4, 2018
    0
    Fan turns on at 185 degrees and turns off at 180. But as soon as it turns off it turn right back on. Constantly running all the time. A/C is not working right now dew to a hole in condenser. I had truck running for 45mins at the end of today's work day and fan never turned off. Is this something to be concerned over?
     
    Turi 385, Oct 4, 2018
    Turi 385, Oct 4, 2018
    #1
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  3. Oct 4, 2018 #2
    boneebone

    boneebone Road Train Member

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    Mar 13, 2009
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    Yes it's a concern because when the fan is on, it's robbing horsepower and fuel economy from your truck.

    It sounds like you need to replace the fan control solenoid.

    It's a Cummins, not a Cummings motor.
     
    boneebone, Oct 4, 2018
    boneebone, Oct 4, 2018
    #2
    mitrucker, Bean Jr. and Klleetrucking Thank this.
  4. Oct 4, 2018 #3
    Turi 385

    Turi 385 Bobtail Member

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    Oct 4, 2018
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    Ok thanks just saw my mistake on Cummins
     
    Turi 385, Oct 4, 2018
    Turi 385, Oct 4, 2018
    #3
    Bean Jr. and boneebone Thank this.
  5. Oct 5, 2018 #4
    J Rich

    J Rich Medium Load Member

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    May 28, 2018
    Atlanta Ga
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    Yeah have that looked at. My 16 KW isx15 fan comes on at 205-210 and off at 180-185.
     
    J Rich, Oct 5, 2018
    J Rich, Oct 5, 2018
    #4
  7. Oct 5, 2018 #5
    mitrucker

    mitrucker Road Train Member

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    Look at the air line to the fan clutch. It may have a hole rubbed in it in the front of the engine.
     
    mitrucker, Oct 5, 2018
    mitrucker, Oct 5, 2018
    #5
  8. Oct 6, 2018 #6
    magoo68

    magoo68 Road Train Member

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    Jun 11, 2011
    st malo mb canada
    0
    Is heater switch in defrost position if so that uses ac which will start fan due to your hole in condensor
     
    magoo68, Oct 6, 2018
    magoo68, Oct 6, 2018
    #6
  9. Oct 6, 2018 #7
    Turi 385

    Turi 385 Bobtail Member

    6
    4
    Oct 4, 2018
    0
    I unplugged the sensor on the high side and turned truck off. Then restarted it and clutch unlocked and started working normal again. Turned on at 205 and cut off about 189-200 mark.
     
    Turi 385, Oct 6, 2018
    Turi 385, Oct 6, 2018
    #7
    magoo68 Thanks this.
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