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3406E temp sender

Discussion in 'Trucks [ Eighteen Wheelers ]' started by billm89, Oct 20, 2014.

  1. Oct 20, 2014 #1
    billm89

    billm89 Bobtail Member

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    Jul 20, 2011
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    Does anyone know where the engine coolant temperature sender for the gauge is located on an 1998 early 3406E Cat with the 40 pin ECM? There is nothing by the thermostat housing except a hose that goes up to the surge tank. I'm looking at one on the back of the head by the firewall with two spade terminals, but I'm not sure it's the one. I'm hoping to get some time to trace wires this week to help figure it out. The gauge worked until last week, but now stays pegged on the low side. Thanks for any help.
     
    billm89, Oct 20, 2014
    billm89, Oct 20, 2014
    #1
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  3. Oct 20, 2014 #2
    mtoo

    mtoo Road Train Member

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    It should be on the thermostat housing, If it's like a 3406C it will be on top. Right behind the A/C compressor.
     
    mtoo, Oct 20, 2014
    mtoo, Oct 20, 2014
    #2
    billm89 Thanks this.
  4. Oct 20, 2014 #3
    QUALITYTRUCK

    QUALITYTRUCK Road Train Member

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    it is a PITA to get at.just like above post said,but you have to look close to see it buried behind a/c compressor.good luck.
     
    QUALITYTRUCK, Oct 20, 2014
    QUALITYTRUCK, Oct 20, 2014
    #3
    billm89 Thanks this.
  5. Oct 20, 2014 #4
    billm89

    billm89 Bobtail Member

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    Thank you guys, I'll look closer tomorrow.
     
    billm89, Oct 20, 2014
    billm89, Oct 20, 2014
    #4
  7. Oct 21, 2014 #5
    beltrans

    beltrans Medium Load Member

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    Nov 26, 2008
    spokane wa
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    On mine 98 3406E 40 pin the gauge is mechanical. From the gauge the capillary tubing going through the firewall to the front top of the cylinder head. It is very close where a fuel line connects to the cylinder head. Yours may be different i.e. electrical....
     
    beltrans, Oct 21, 2014
    beltrans, Oct 21, 2014
    #5
  8. Oct 21, 2014 #6
    billm89

    billm89 Bobtail Member

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    Jul 20, 2011
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    Mine is definitely electrical, I'm familiar with the capillary ones from the old race car days. Thanks for the input!
     
    billm89, Oct 21, 2014
    billm89, Oct 21, 2014
    #6
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