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engine fan runs constant

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Perchie15, Aug 4, 2023.

Page 2 of 2
  1. Aug 5, 2023 #11
    Perchie15

    Perchie15 Light Load Member

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    I did by pass the coolant temp sensor that’s in the reservoir tank well the male side and fan still stayed on, WHERES the other sensor then?
     
    Perchie15, Aug 5, 2023
    Perchie15, Aug 5, 2023
    #11
    Rideandrepair Thanks this.
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  3. Aug 5, 2023 #12
    JB7

    JB7 Heavy Load Member

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    Laurel, MD
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    The one in the tank should be the coolant level sensor. What year truck? Are there any codes? Did you carefully watch the video?
    Detroit DD13/15/16 I6 Engine Sensor Locations – TroubleCodes.net
     
    JB7, Aug 5, 2023
    JB7, Aug 5, 2023
    #12
    Rideandrepair Thanks this.
  4. Aug 5, 2023 #13
    Lazer

    Lazer Road Train Member

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    I believe that is true on the newer generation of trucks.
     
    Lazer, Aug 5, 2023
    Lazer, Aug 5, 2023
    #13
    Rideandrepair Thanks this.
  5. Aug 5, 2023 #14
    Perchie15

    Perchie15 Light Load Member

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    Aug 16, 2021
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    Perchie15, Aug 5, 2023
    Perchie15, Aug 5, 2023
    #14
    Rideandrepair Thanks this.
  7. Aug 5, 2023 #15
    Perchie15

    Perchie15 Light Load Member

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    Aug 16, 2021
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    I did now and yeah it works!! No more constant fan!! Thankfully cuz lastnight we blew a belt on the truck. But still no ac compressor kicking in. Argh
     
    Perchie15, Aug 5, 2023
    Perchie15, Aug 5, 2023
    #15
    gekko1323 and Rideandrepair Thank this.
  8. Feb 25, 2024 #16
    gekko1323

    gekko1323 Road Train Member

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    Henderson, NV
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    So what was the problem? What exactly did you do to solve the problem?
     
    gekko1323, Feb 25, 2024
    gekko1323, Feb 25, 2024
    #16
  9. Feb 25, 2024 #17
    Perchie15

    Perchie15 Light Load Member

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    Aug 16, 2021
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    End up being a broken wire that crosssed under the transmission rubbed through.
     
    Perchie15, Feb 25, 2024
    Perchie15, Feb 25, 2024
    #17
    gekko1323 and Heavyd Thank this.
  10. Feb 25, 2024 #18
    gekko1323

    gekko1323 Road Train Member

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    Henderson, NV
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    Thanks for your quick reply. So what exactly did that wire have to do with the fan? My fan has been constantly on since I bought the truck, so I figured now was as good time as any to address it. It's not really doing any harm because the truck runs cool, even in the desert. But the 6.5 mpg and loss of power on hills has compelled me to finally fix it.
     
    gekko1323, Feb 25, 2024
    gekko1323, Feb 25, 2024
    #18
  11. Feb 25, 2024 #19
    Perchie15

    Perchie15 Light Load Member

    237
    71
    Aug 16, 2021
    0
     
    Perchie15, Feb 25, 2024
    Perchie15, Feb 25, 2024
    #19
  12. Feb 25, 2024 #20
    Perchie15

    Perchie15 Light Load Member

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    Aug 16, 2021
    0
    It ran to the ac compressor and so that means the compressor wasn’t running at all and somehow that was signalling the fan to not shut off that that wire I believe ran to the ECM I never did follow it fully but was headed that direction.
    But there are a few reasons why the fan could be running constantly the hi/low pressure switches. And theirs a triangular switch also. But not all stars have that
     
    Perchie15, Feb 25, 2024
    Perchie15, Feb 25, 2024
    #20
    gekko1323 Thanks this.
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