3406E fan won't kick out

Discussion in 'Trucks [ Eighteen Wheelers ]' started by sixgunservices, Jan 8, 2011.

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  1. Jan 8, 2011 #1
    sixgunservices

    sixgunservices Bobtail Member

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    Jan 8, 2011
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    Have a 98 379 Pete, with the 3406e, fan won't kick out. Just bought this truck, it went through a diesel mechanic tech school where they went through everything external, good possibility it is something that wasn't tightened up or set right. Where should I start?
     
    sixgunservices, Jan 8, 2011
    sixgunservices, Jan 8, 2011
    #1
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  3. Jan 8, 2011 #2
    CallMeArty

    CallMeArty HaMMeRED DoWN

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    Do you mean kick on? Have you unplugged the soleniod to see if it would kick on?
     
    Last edited: Jan 8, 2011
    CallMeArty, Jan 8, 2011
    CallMeArty, Jan 8, 2011
    #2
  4. Jan 8, 2011 #3
    Pablo-UA

    Pablo-UA Road Train Member

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    I do not understand, fan wont working, yeah?

    Does fan work when air is low?
     
    Pablo-UA, Jan 8, 2011
    Pablo-UA, Jan 8, 2011
    #3
  5. Jan 8, 2011 #4
    DGB0331

    DGB0331 Bobtail Member

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    It won't turn on with the switch or it won't turn on automatically? My 1LW 3406E in a 379 won't turn on until coolant reaches 217 degrees.
     
    DGB0331, Jan 8, 2011
    DGB0331, Jan 8, 2011
    #4
  7. Jan 8, 2011 #5
    underpsi

    underpsi Road Train Member

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    Could be several reason why it won't shut off. Your best bet is to go through the switch status's in Cat ET if you have access. It could be something with an a/c switch or just the hub seized up or a bad solenoid... etc.
     
    underpsi, Jan 8, 2011
    underpsi, Jan 8, 2011
    #5
  8. Jan 8, 2011 #6
    chuy1978

    chuy1978 Bobtail Member

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    I had the same problem. I started at the switch. Take the switch out and move the wires to another one and see if that works. If not then the sensor may be bad or going out. The sensor is located under the alternator. The sensor is a pain to get to. I bypassed it and put in the head my own sensor. I hope that this helps you..
     
    chuy1978, Jan 8, 2011
    chuy1978, Jan 8, 2011
    #6
  9. Jan 8, 2011 #7
    sixgunservices

    sixgunservices Bobtail Member

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    Jan 8, 2011
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    Thanks, I'm going to try the switch. And yes, I do mean it won't kick out, runs all the time. How did you bypass the sensor? That might get me by until I can get one, I live in a small town will probably have to order it, and I need to put this truck to work. Thanks
     
    sixgunservices, Jan 8, 2011
    sixgunservices, Jan 8, 2011
    #7
  10. Jan 8, 2011 #8
    Pablo-UA

    Pablo-UA Road Train Member

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    runs all the time... Are you sure you have no solenoid/air issues?
     
    Pablo-UA, Jan 8, 2011
    Pablo-UA, Jan 8, 2011
    #8
  11. Jan 8, 2011 #9
    Mr. Haney

    Mr. Haney Road Train Member

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    First off since it was at a tech school and they were able to play inside the ECM...........check customer parameter A/C Switch Fan On-Time(0 = Off)...........set it to 0

    The early Pete's need this parameter set to 0 or the fan will never shut off.
     
    Mr. Haney, Jan 8, 2011
    Mr. Haney, Jan 8, 2011
    #9
  12. Jan 8, 2011 #10
    Pablo-UA

    Pablo-UA Road Train Member

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    yeah, to be sure I use Cat ET software
     
    Pablo-UA, Jan 8, 2011
    Pablo-UA, Jan 8, 2011
    #10
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