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Transmission Cooler missing…I Know I know

Discussion in '2.5 Gen Tundras (2014-2021)' started by ColoradoCub, Sep 27, 2021.

  1. Oct 12, 2021 at 2:00 PM
    #541
    FISHN43

    FISHN43 New Member

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    Heres the TSB.

    8159637A-0149-4CC7-9F5B-F1F24F0CC160.jpg
     
  2. Oct 12, 2021 at 2:06 PM
    #542
    ultra1988

    ultra1988 New Member

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    Covered under the federal emissions warranty instead of power train, probably because it has to do with engine/transmission programming. And they won’t do it unless you actually experience an overheat alarm. So having 260 logged with proof won’t warrant it.

    I will say that if you intend to fight this down the road, I would take your truck in with the alarm ASAP. Dont fight the game, play it.
     
  3. Oct 12, 2021 at 2:43 PM
    #543
    ColoradoCub

    ColoradoCub [OP] New Member

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    Didnt know I needed to load my resume with my avatar…lol
     
  4. Oct 12, 2021 at 2:46 PM
    #544
    GTundraX

    GTundraX Rub some dirt on it.

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    I'm not sure mine would be covered anyway under the "specified conditions" lol
     
  5. Oct 12, 2021 at 2:58 PM
    #545
    ColoradoCub

    ColoradoCub [OP] New Member

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    That’s the best solution to this problem!
     
  6. Oct 12, 2021 at 4:59 PM
    #546
    19tundraguy

    19tundraguy New Member

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    I know this subject has been beat to death! but I just wanted to share a response from Toyota to a question I asked regarding what gear to tow in. My question is below and their response is above. Screenshot_20211012-173412_Email.jpg
     
    AZBoatHauler likes this.
  7. Oct 12, 2021 at 5:22 PM
    #547
    Clemsonman14

    Clemsonman14 New Member

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    That almost reads like S4 is how they want you to tow. Who knows honestly
     
    AZBoatHauler likes this.
  8. Oct 12, 2021 at 5:41 PM
    #548
    ultra1988

    ultra1988 New Member

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    Being in 4 S mode while towing a small light trailer on regular freeways is rediculous. 5 S works fine for me with zero gear hunting and TC stays locked, if it gets hilly I drop to 4 S.
     
  9. Oct 12, 2021 at 6:00 PM
    #549
    ColoradoCub

    ColoradoCub [OP] New Member

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    The response is a verbatim regurgitation of the owners manual. D with tow haul when towing and S4 on downhill grades to assist with engine braking, that’s right out of the Owners Manual.
     
  10. Oct 12, 2021 at 6:15 PM
    #550
    John175

    John175 Not Sure

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    Non-stop mods
    Nothing like a disgruntled ex-employee on a forum. You'll teach them to mess with you! :rofl:
     
    hagrid likes this.
  11. Oct 12, 2021 at 6:30 PM
    #551
    ColoradoCub

    ColoradoCub [OP] New Member

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    Seriously? Yeah I’m a disgruntled Toyota employee so I fill my garage with their products just in spite. Lol

    A54C4C6C-1CCB-41E6-B4AD-D7DA525ECBC0.jpg
     
    Terndrerrr likes this.
  12. Oct 13, 2021 at 5:07 AM
    #552
    blanchard7684

    blanchard7684 New Member

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    This is the precise scenario that I'm in that requires the cooler.
     
  13. Oct 13, 2021 at 5:22 AM
    #553
    Jaypown

    Jaypown New Member

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    I wonder if any 2019-2021 Tundra transmissions have exploded due to heat since this thread had started.

    This thread is like a car crash. I can't look away from it. Then here I am also crashing into the 19 car pile up.
     
  14. Oct 13, 2021 at 6:54 PM
    #554
    sportbikenut

    sportbikenut New Member

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    Traded in 2016 Tundra Limited DC Silver 4x4
    Update on actual readings. In my 2016, driving highway route this past Monday (65 to 70mph) my highest and average temp was 192. Ambient temp was 62.
    Traded in and picked up my new 2021. They are both identical DC Limited 4x4 model.
    On return trip today over the same route and slightly slower speeds, similar Ambient temp, my trans temp and torque converter, were 210. So 18 deg higher. Keep in mind that when towing my 6k trailer over the same route a few months back, when ambient temps were 85 to 90, my trans temp stayed around 199.
    So yeah, I'm definitely installing a transmissiion cooler. They are necessary.
    I plan on keeping this truck a long time.
     
    Bammer likes this.
  15. Oct 13, 2021 at 7:59 PM
    #555
    Terndrerrr

    Terndrerrr it's good to get lost once in a while

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    Here’s a snapshot of my typical temps in 4Hi (edit: with the Hayden cooler I installed almost a year ago). After 45 min of very twisting, hilly pavement, we hit some twisting, hilly gravel roads in East Tennessee with lots of elevation change. I put it in 4Hi once we hit the gravel, and at the time of this snapshot, I had been in 4Hi for 7 miles worth.
    47798B3D-C213-480A-9A56-CD17392D8EEB.jpg
    At this point, that little puck has had 194ºF coolant flowing through it working to warm the trans fluid to the same temp. It still hadn’t got there yet, after an hour. This leads me to believe it is just as inefficient when it’s attempting to cool heated trans fluid back down to engine coolant temps.
    Anyway, more fuel for the fire. :bananadead:
     
  16. Oct 13, 2021 at 8:03 PM
    #556
    ColoradoCub

    ColoradoCub [OP] New Member

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    Those temps have to be with a cooler right?
     
  17. Oct 13, 2021 at 8:10 PM
    #557
    crewmaxlmt

    crewmaxlmt How dare you!

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    Use your cooler pinned?
     
  18. Oct 13, 2021 at 8:16 PM
    #558
    Terndrerrr

    Terndrerrr it's good to get lost once in a while

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    Yep.
    Nope. I do believe the thermostat opened sometime in the middle of that trip though.
     
  19. Oct 13, 2021 at 9:01 PM
    #559
    GCanuck

    GCanuck New Member

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    Spray in box. Tonneau
    I wonder if we will see this TSB in Canada. It’s says “USA Market” at the top.
     
  20. Oct 14, 2021 at 6:15 AM
    #560
    blanchard7684

    blanchard7684 New Member

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  21. Oct 14, 2021 at 11:47 AM
    #561
    timsp8

    timsp8 Member

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    If you stop it at 6:41 and again at 6:46 it shows both sides. I don’t see any lines going to the transmission. I dont even see any type of puck.

    D4B64A02-7A9B-4648-BA04-FF4CAFFAC92C.jpg
    E2B2B2F9-86E2-4B0C-85FE-935D723F5DB4.jpg
     
  22. Oct 14, 2021 at 11:57 AM
    #562
    timsp8

    timsp8 Member

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    Couple more views.

    67F5D76B-BACF-46E5-962B-22E67F83CC36.jpg
    C0EE580E-6854-46CE-B9B2-DF6EBFCC5D18.jpg
     
  23. Oct 14, 2021 at 12:03 PM
    #563
    FISHN43

    FISHN43 New Member

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    Does it really matter if the 3rd gen has a trans cooler?? Its a completely new/different engine and transmission. Can’t even start to compare it to the “2.5” gen Tundras that had the cooler deleted for still unknown reasons..
     
  24. Oct 14, 2021 at 12:05 PM
    #564
    Terndrerrr

    Terndrerrr it's good to get lost once in a while

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    I agree that there is a world of difference between “look at this new transmission we designed without an external cooler” and “we deleted the cooler off the exact same transmission we originally designed with one several years ago”.

    If the 3rd gen doesn’t have one, it does NOT immediately follow that deleting the cooler on 2019-2021 Tundras was the correct or best decision.
     
    mech_engineer09, Jaypown and FISHN43 like this.
  25. Oct 14, 2021 at 12:10 PM
    #565
    FISHN43

    FISHN43 New Member

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    100% !
     
    Terndrerrr likes this.
  26. Oct 14, 2021 at 12:16 PM
    #566
    timsp8

    timsp8 Member

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    Because if they added it back, some would use that as more justification that it shouldn’t have ever been removed.
     
  27. Oct 14, 2021 at 12:38 PM
    #567
    a_double

    a_double New Member

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    I'm here looking at the body mount clearance.
     
  28. Oct 14, 2021 at 1:38 PM
    #568
    blanchard7684

    blanchard7684 New Member

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    yeah the transmission lines are not fully run.

    however the set up with the small hard lines is nearly identical to my 4 runner.
     
  29. Oct 14, 2021 at 5:34 PM
    #569
    timsp8

    timsp8 Member

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    Which ones? This is the first time I’ve looked hard at a hybrid so I don’t know what all the lines are.
     
  30. Oct 15, 2021 at 8:18 AM
    #570
    68rs75z28

    68rs75z28 New Member

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    Just to jump into this. I live in the central valley of CA(hot) and did a back to back test.
    Without the cooler just driving around unloaded and normal I was seeing 220*f pan temps.

    With a pinned cooler I saw about 175 on the same loop(I actually went farther to try and heat it more).

    Today on my drive to work it reached 145* pinned(55* temp outside) so I will unpin mine for the winter. I don't drive it much currently, but will begin to at the end of november.
     
    GTundraX likes this.

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