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2010 Peterbilt 386 Engine Fan Runs Constantly

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Kool Aid, May 5, 2023.

  1. May 5, 2023 #1
    Kool Aid

    Kool Aid Bobtail Member

    15
    13
    Aug 3, 2015
    North Alabama
    0
    Alright I got a 2010 Peterbilt 386 with a ISX 15. The engine fan will run constantly when accelerator is pressed. May cut off for 5 seconds and jump back on. Runs with or without A/C on. I have been out of town all week and left it at shop to get things worked on and they can’t seem to figure it out. I don’t know what all they have checked won’t be back in town till Monday morning. Anyone had this problem and what do I need to be looking for to ask if they tried.
     
    Kool Aid, May 5, 2023
    Kool Aid, May 5, 2023
    #1
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  3. May 5, 2023 #2
    beastr123

    beastr123 Road Train Member

    2,916
    23,891
    Jan 2, 2014
    Moose Jaw SK CAN
    0
    This may be a silly question but is your heater control set on defrost?
    Most trucks activate the A/C when set to defrost to dehumidify the air being blown onto a cold window. If your A/C pressures are high the fan will come on until the pressure drops.
    This is not the only reason but it can be one of the simple ones to fix.
     
    beastr123, May 5, 2023
    beastr123, May 5, 2023
    #2
    MACK E-6 Thanks this.
  4. May 5, 2023 #3
    Kool Aid

    Kool Aid Bobtail Member

    15
    13
    Aug 3, 2015
    North Alabama
    0
    It stays on even with everything cut off. But thanks that will be something I will look at.
     
    Kool Aid, May 5, 2023
    Kool Aid, May 5, 2023
    #3
  5. May 5, 2023 #4
    zinita17601

    zinita17601 Road Train Member

    1,318
    1,603
    Aug 19, 2010
    lancaster pa
    0
    Fan clutch selenoid
     
    zinita17601, May 5, 2023
    zinita17601, May 5, 2023
    #4
  7. May 7, 2023 #5
    Ex-Trucker Alex

    Ex-Trucker Alex Road Train Member

    1,498
    2,589
    Jan 7, 2023
    0
    Or, more likely, the solenoid...
     
    Ex-Trucker Alex, May 7, 2023
    Ex-Trucker Alex, May 7, 2023
    #5
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