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Thermostat Jiggle Valve on 3.4L 6 Cyl TRD

Discussion in '1st Gen. Tacomas' started by skeezix, Jan 20, 2014.

  1. Jan 20, 2014 at 11:22 AM
    #1
    skeezix

    skeezix [OP] Well-Known Member

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    After replacing the thermostat I was browsing through my repair manual and noticed that the jiggle valve must be up plus-or-minus 15 degrees. I don't recall in which position I installed the thermostat.

    How important is the location of the jiggle valve and if it is not up what will happen?
     
  2. Jan 20, 2014 at 12:35 PM
    #2
    trdtoy

    trdtoy Well-Known Member

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    If air is not bled from system it can overheat. Purpose of jiggle valve is to bleed system of air without having to do it manually.
     
  3. Jan 20, 2014 at 3:00 PM
    #3
    Dirty Pool

    Dirty Pool Lost In The Ozone

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    I'm getting a little tired of posting this, so for one last time.
    The Toyota FSM gives that spec for the 4 cyls and "down" (6:00) for the 3.4.
    It is has been widely documented on this and many other forums that placing it "up" on the 3.4 results in about a 10* increase in the ECT sensor reading.
    Read this entire thread before commenting. http://www.yotatech.com/f2/5vz-fe-r...ing-belt-pictures-pleasure-249481/index2.html

    FSM for the 3.4
    [​IMG]
     
  4. Jan 20, 2014 at 3:44 PM
    #4
    tacomataco2

    tacomataco2 Well-Known Member

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    I was actually just wondering this the other day... You da man
     
  5. Jan 21, 2014 at 3:46 AM
    #5
    ARB1977

    ARB1977 Don't be a dick

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    10-13 degree difference in temps is what I got.
     
  6. Jan 25, 2014 at 3:04 PM
    #6
    skeezix

    skeezix [OP] Well-Known Member

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    When I removed the thermostat, the jiggle pin was at the 12 o'clock position and when I installed the new thermostat I placed the jiggle pin at the 12 o'clock position.

    I bought the truck brand new in January of 1998, BTW.
     
  7. Feb 20, 2014 at 11:47 PM
    #7
    JJ04TACO

    JJ04TACO Well-Known Member

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    I just replaced rad hoses and thermostat. I was confused after reading in my Haynes manual that it should be at 12 o'clock. Mine was coincidentally came out with it at 7 o'clock. I was confused as I'm the original owner and it's other original thermostat, so I searched here. I trust y'all and the FSM that was referenced so, I put it at 6. Strange about the typo in the Haynes though been using those for 20 years...
     
  8. Feb 21, 2014 at 7:09 AM
    #8
    joemauma

    joemauma Well-Known Member

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    I just picked up a Gates 170 degree thermostat to replace mine and it doesn't have a jiggle valve. Do you guys think this will lead to problems?

    If so, does anyone have a part number for a toyota 170 degree thermostat for the 3.4?
     
  9. Feb 21, 2014 at 7:16 AM
    #9
    lipster

    lipster Well-Known Member

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    Does it have a little "bite" out of the outer circumference? If so, put it in with the bite at 6 o'clock. Or, pays your money at the dealer.
     
  10. Feb 21, 2014 at 8:51 AM
    #10
    JJ04TACO

    JJ04TACO Well-Known Member

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    PN 90916-03075

    Toyota part.
     
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