3406E 1LW fan settings

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Slow302, Oct 16, 2021.

  1. Slow302

    Slow302 Light Load Member

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    I have 3406E 1LW19521. Just finished platinum in frame at KW at 980k due to coolant in oil.
    I told KW to change fan setting that in ecm from 217 down to 205. But they saying there was no fan setting when they tried. I know tbey were using USB Link 2 and Cat ET 2020A. So is this something i have to go to the Cat and have them change fan settings or is it impossible to change it. Im not looking for flash file for right now, just lower fan settings like 205 on and 195 off
    Thanks
     
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  3. Oxbow

    Oxbow Road Train Member

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    Do you know what temp regulator you have? 195 off with a 195 t-stat could be problematic.

    I cannot help with the ecm settings, but thought the thermostat was worth mentioning.
     
  4. Slow302

    Slow302 Light Load Member

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    I installed 180f thermostats long time ago before in frame. And when they did in frame i paid extra for 2 new cat 180 thermostats. Truck runs 179-181 all day long cruising on flat. On hard hills i use manual switch to cool it down. I just want lower ECM settings for precaution
     
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  5. Goodysnap

    Goodysnap Road Train Member

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    The engine fan on coolant temp is not adjustable and preset @ 217.

    You can only adjust the cycle time and duration.
     
  6. Slow302

    Slow302 Light Load Member

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    So only way to get 205f fan on and 195f off is to get pre low nox file ???
     
  7. wore out

    wore out Numbered Classic

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    There is a way......take it away from ECM. Buy a switch for a mechanical engine. Install the switch behind the thermostat housing. Run a key on power to 1 side. Run the other side to the fan solenoid. Leave the ECM unplugged at fan solenoid. Or if you want to get fancy put a diode between ECM and fan solenoid to prevent the new set up from back feeding to the ECM. That leaves you a back up to turn the fan on should the new set up fail.
     
  8. Slow302

    Slow302 Light Load Member

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    Well it have to be hooked to the ECM because AC, i think AC uses ECM to turn fan on when idling and when i get up to speed it turn fan off and fan never comes on for AC when im driving only at traffic lights and idling. So maybe i can install thermo switch that will give pover to truck manual switch that i have on dashboard ??? This way it womt back feed ECM
     
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  9. wore out

    wore out Numbered Classic

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    Come out of high pressure A/C switch that turns fan on to the fan solenoid side of the manual switch you install behind thermostat housing. Also if you put a diode between the ECM and fan solenoid that will still function as it should. All a diode does it let current run 1 way.


    It’s no different than having a manual fan switch on the dash. Instead of using a toggle switch to turn fan on your using a temperature switch
     
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