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2013 T800 ISX Clutch fan on all the time. Schematics?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Schmeck, Oct 12, 2019.

  1. Oct 12, 2019 #1
    Schmeck

    Schmeck Bobtail Member

    5
    1
    Mar 18, 2018
    0
    I drive a 2013 T800 with an ISX clutch fan on almost all the time. SN:360788. Anyone have fan clutch schematics? I have checked the air side of the system it appears to be operating properly. temp gauge appears to work properly almost always operating at 190* F. Does the fan clutch circuit use the same coolant temp sensor as the gauge? Thanks in advance for any help and tips.
     
    Schmeck, Oct 12, 2019
    Schmeck, Oct 12, 2019
    #1
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  3. Oct 12, 2019 #2
    Snailexpress

    Snailexpress Road Train Member

    2,675
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    Apr 28, 2014
    Rocky
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    Fan is on for coolant temperature, refrigerant pressure in AC system, oil temperature, intake air temperature. Turn AC off to eliminate.
     
    Snailexpress, Oct 12, 2019
    Snailexpress, Oct 12, 2019
    #2
  4. Oct 12, 2019 #3
    pushbroom

    pushbroom Road Train Member

    1,779
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    Sep 1, 2012
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    Yes same coolant temp sensor as the gauge. Egr temp will also turn the fan on. If you get it on a laptop it will tell you what circuit is demanding the fan on and helps narrow it down instead of chasing everything. A/c high pressure switch is a good place to start. Even with the a/c off if the pressure is high or wires are broken to the sensor it will still command the fan on.
     
    pushbroom, Oct 12, 2019
    pushbroom, Oct 12, 2019
    #3
    Working2party, spsauerland and Snailexpress Thank this.
  5. Oct 13, 2019 #4
    pup

    pup Light Load Member

    252
    256
    Dec 3, 2011
    n.h.
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    Some engine faults will turn the fan on. If the check engine light is on look into that first.
     
    pup, Oct 13, 2019
    pup, Oct 13, 2019
    #4
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