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Engine Fan Staying On

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by KWP_15, Jul 28, 2020.

Page 1 of 2
  1. Jul 28, 2020 #1
    KWP_15

    KWP_15 Bobtail Member

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    Mar 8, 2019
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    I have a 2018 Kenworth t680, and the engine fan is acting unusual. It is staying on longer at times, even when the indicator light turns off. It acts normal sometimes, but then at times it has a hard time turning off. The truck does have some sort of air leak currently. What can the issue be? Where is the solenoid located? What should I check for?

    Thanks!
     
    KWP_15, Jul 28, 2020
    KWP_15, Jul 28, 2020
    #1
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  3. Jul 28, 2020 #2
    olddog_newtricks

    olddog_newtricks Medium Load Member

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    Does it only stay on when the A/C is On? Could be a pressure switch.
     
    olddog_newtricks, Jul 28, 2020
    olddog_newtricks, Jul 28, 2020
    #2
    QUALITYTRUCK Thanks this.
  4. Jul 28, 2020 #3
    Roberts450

    Roberts450 Road Train Member

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    What kind of air pressure problem are you having? The fans are designed to lock on when secondary air drops below 50psi.
     
    Roberts450, Jul 28, 2020
    Roberts450, Jul 28, 2020
    #3
  5. Jul 28, 2020 #4
    KWP_15

    KWP_15 Bobtail Member

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    I haven't tested the connection with ac. I will try turning it off, and seeing if there's any difference.
     
    KWP_15, Jul 28, 2020
    KWP_15, Jul 28, 2020
    #4
  7. Jul 28, 2020 #5
    KWP_15

    KWP_15 Bobtail Member

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    I'm just losing air when parked overnight. It doesn't loose pressure while driving.
     
    KWP_15, Jul 28, 2020
    KWP_15, Jul 28, 2020
    #5
  8. Jul 28, 2020 #6
    QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    romulus,mi
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    You have probably inadvertently solved your own problem. Removing air from clutch engages fan. Conversely, applying air disengages it. Build truck air to 120 psi, turn truck off, count to 10, turn key on. Fan should disengage without any air leaking from clutch or air line going to it. If no leak, report back for further troubleshooting help.
     
    QUALITYTRUCK, Jul 28, 2020
    QUALITYTRUCK, Jul 28, 2020
    #6
    Rideandrepair Thanks this.
  9. Jul 28, 2020 #7
    KWP_15

    KWP_15 Bobtail Member

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    It doesn't really stay on when I start it up in morning. It's more like at random times during day while driving. The indicator light for fan turns off, but fan keeps running for 5-10min.
     
    KWP_15, Jul 28, 2020
    KWP_15, Jul 28, 2020
    #7
  10. Jul 28, 2020 #8
    McMahons Trucking

    McMahons Trucking Light Load Member

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    Jul 4, 2018
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    Probably good thats it's staying on. It's been over 100 degrees outside.
     
    McMahons Trucking, Jul 28, 2020
    McMahons Trucking, Jul 28, 2020
    #8
  11. Jul 28, 2020 #9
    KWP_15

    KWP_15 Bobtail Member

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    Mar 8, 2019
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    I've been testing it today, and it has something to do with the ac. When I turn the ac off, it turns off in a bit. Something with the ac, causing it to stay on..
     
    KWP_15, Jul 28, 2020
    KWP_15, Jul 28, 2020
    #9
  12. Jul 28, 2020 #10
    Concorde

    Concorde Road Train Member

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    Jun 29, 2016
    West Melbourne Florida
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    Fan solenoid is failing..soon it will just stay on.
    I just went through it with my 2014 t680

    if you want a picture of the location I will upload one.
     
    Concorde, Jul 28, 2020
    Concorde, Jul 28, 2020
    #10
    Rideandrepair and KWP_15 Thank this.
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