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thermostat confusion

Discussion in '2nd Gen. Tacomas (2005-2015)' started by bushman31, Jul 20, 2022.

  1. Jul 20, 2022 at 10:04 AM
    #1
    bushman31

    bushman31 [OP] Well-Known Member

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    Old Man EMU suspension, 33" tires, 4.56 gears, Leer shell, airlift airbags, Fab 4's rear bumper and tire carrier, and some other shit.
    I have a 2013 Tacoma with the 4.0 V6 engine. I am doing a coolant change, along with hoses and thermostat. I bought a Toyota thermostat, part# 16031-0P010, and this has the integrated housing. Everything I read says the jiggle pin should be at the 6 o'clock position, however Toyota has it at the 12 o'clock position. Which is correct?
    Thanks,
    Ron W.
     
  2. Jul 20, 2022 at 10:17 AM
    #2
    Dm93

    Dm93 Test Don't Guess

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    It's primary purpose is to allow any air that is behind the thermostat to escape so ideally you want it to the top.
     
  3. Jul 20, 2022 at 10:19 AM
    #3
    BassAckwards

    BassAckwards Well-Known Member

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    12 o'clock
     
  4. Jul 20, 2022 at 11:08 AM
    #4
    bushman31

    bushman31 [OP] Well-Known Member

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    Old Man EMU suspension, 33" tires, 4.56 gears, Leer shell, airlift airbags, Fab 4's rear bumper and tire carrier, and some other shit.
    I know on the 2.7L it is 12 o'clock, but I could have sworn I read 6 o'clock for the 4.0L.
    Ron W.
     
    BassAckwards[QUOTED] likes this.
  5. Jul 20, 2022 at 11:31 AM
    #5
    TnShooter

    TnShooter The TacomaWorld Stray

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    I do it at the top. Because air floats. And that’s where the air should be. The FSM doesn’t specify for the 2nd Gen trucks.

    I believe the 1st Gen trucks had a recommended position. That’s probably where the position you are referring to comes from.

    When in doubt, I usually put stuff back the way it comes out.
     
  6. Jul 20, 2022 at 11:49 AM
    #6
    BassAckwards

    BassAckwards Well-Known Member

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    I was also under the impression it needed to be this way on the 4.0. As others have stated, air will rise to the top in the coolant system so having that jiggle valve at 12o’clock is allowing the air bubbles to get past the t-stat and prevent air pockets in the system
     
  7. Jul 20, 2022 at 1:04 PM
    #7
    bushman31

    bushman31 [OP] Well-Known Member

    Joined:
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    Male
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    Ron
    Draper, UT
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    TRD
    Old Man EMU suspension, 33" tires, 4.56 gears, Leer shell, airlift airbags, Fab 4's rear bumper and tire carrier, and some other shit.
    Thanks guys for the responses. I have no idea how I got confused but I will blame it on "senior moment".
     
    TnShooter and Key-Rei like this.

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