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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 4, 2021 at 9:11 AM
    #481
    Summitroad

    Summitroad New Member

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    I expect more from Toyota...
     
    mech_engineer09 likes this.
  2. Oct 4, 2021 at 9:22 AM
    #482
    sportbikenut

    sportbikenut New Member

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    Exactly. Whataboutism does not fix the issue being discussed.
     
  3. Oct 4, 2021 at 9:27 AM
    #483
    sportbikenut

    sportbikenut New Member

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    I'm curious if the last manufactured 2021's have this new software update. That is an invitation for disaster if Toyota did was raise the temp before alarm. They are just digging in. Refuse to admit an issue. This reminds me of what they did regarding the Brake Controller. I'll start a different thread for that one.

    Can someone provide the entire TSB so that we can read the recommended repair section?
     
  4. Oct 4, 2021 at 10:56 AM
    #484
    Allrsdup

    Allrsdup New Member

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    Ambient temps were about 80° and my elevation was about 2,000 ft above sea level. Some hilly freeway driving not flat but not mountain passes.
     
  5. Oct 4, 2021 at 11:10 AM
    #485
    sportbikenut

    sportbikenut New Member

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    Traded in 2016 Tundra Limited DC Silver 4x4
    My 2016 would have been in the 190's under those conditions.
     
  6. Oct 4, 2021 at 1:33 PM
    #486
    ColoradoCub

    ColoradoCub [OP] New Member

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    How would the transmission that as no ability to cool itself manage the temps better? Has to be an alarm range adjustment so you won’t know it’s really hot, it’s not like it tells you the actual temperature anywhere.
     
  7. Oct 4, 2021 at 2:01 PM
    #487
    SSPey

    SSPey .

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    By changing “shift mapping” so that the torque converter locks more aggressively. It won’t be better than a real cooler, but better than an unlocked converter.

    I find it remarkable that for all the people who’ve been troubled by the lack of transmission cooler, only a few here have managed to have a thread blow up over it. Rarefied air!
     
    Bammer, Clemsonman14 and hagrid like this.
  8. Oct 4, 2021 at 4:04 PM
    #488
    GCanuck

    GCanuck New Member

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    I think I have a tranny cooler in my 2020 TRD Sport. It came with a trailer brake control package. Hard to see in the front, but ot looks like another rad in front with pipes leading back. The a/c one is lower. 2B725C20-4831-4D1F-86B4-7AFF1F6B97E6.jpg
     
  9. Oct 4, 2021 at 4:05 PM
    #489
    timsp8

    timsp8 Member

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    That’s your ac condenser and lines. No 2020 came with a trans cooler from the factory.
     
  10. Oct 4, 2021 at 4:13 PM
    #490
    Mad Max

    Mad Max New Member

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    LMAO!!!!! You have a cooler!! Its for your AC
     
  11. Oct 5, 2021 at 4:46 AM
    #491
    blanchard7684

    blanchard7684 New Member

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    Bud, that is the ac condenser.
     
  12. Oct 5, 2021 at 7:32 AM
    #492
    GCanuck

    GCanuck New Member

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    Ya. I got it!
     
  13. Oct 5, 2021 at 7:38 AM
    #493
    coldcanuk

    coldcanuk New Member

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    Not everyone is a blue seal mechanic. I didn't find the post funny? I thought it was cool some guy took the time to take a picture and make a comment using 'I think' not to get anyone excited.

     
  14. Oct 8, 2021 at 12:03 PM
    #494
    realprotundra

    realprotundra Always Skeptical

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    So for those following along, service just called and said that they had to add fluid to the transmission and that it appears to have been underfilled from the factory. I'll keep you posted on whether the slipping/failure to engage in reverse (again 2 times in about 11k miles) happens again now that it has been filled and also what trans temps are on my next tow (although it won't be 100+ degrees ambient again for several months). I'll also be calling Toyota to try to get an extended warranty due to the underfilled transmission and very high trans fluid temps. They probably won't do it but worth a shot.
     
    Melikeymy beer and Acedude like this.
  15. Oct 8, 2021 at 12:12 PM
    #495
    timsp8

    timsp8 Member

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    There was a post a while ago by a guy who said his was shifting weird and that his was overfilled from the factory. He said the factory went by the spec ‘with’ a cooler and it was a little too much. Haven’t hear of any others that were underfilled.
     
    realprotundra likes this.
  16. Oct 8, 2021 at 12:18 PM
    #496
    realprotundra

    realprotundra Always Skeptical

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    Yeah, for all I know they didn't actually do anything at all. That being said, this dealership service department has been very good to me and really went to bat for me with the Tacoma headlight issue so I have no real reason not to trust them. Also seems odd that they would say that rather than "cannot duplicate" if they weren't actually going to do anything.
     
    timsp8 likes this.
  17. Oct 12, 2021 at 10:25 AM
    #497
    GTundraX

    GTundraX Rub some dirt on it.

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    Had the warning light come on our 2019 this past weekend while overlanding.

    Drove about 340 miles on paved highway with a few stops along the way, then aired down our tires and plugged in our ScanGauge to proceed down a dirt road. It was a flat, level dirt road for about 4 miles, then we switched to 4lo and proceeded up a trail.

    We went .5 mi with an ascent of 250 ft in elevation; it was pretty steep and we were taking it slow, but the transmission light went off and the ScanGauge read 260 degrees!!! WHAT?! Also, it was only about 65-70 degrees outside, so nothing extreme.

    We followed the owners manual instructions which said to park the vehicle and see if the light goes off. The light went off and we waited for the temperature to go down a bit more. Started again, drove about .10 mi with about 80 ft of ascent, and it went off again. We repeated the previous steps, switched to manual shifting, and didn't have a problem after that (except when we tried to go back to automatic).

    The ScanGauge stayed between 210 and 220...so 4lo and shifting manually helped, but I don't think the manual shifting should be used like this and that still seems pretty high to me. We drive rugged terrain about once a month to camp in the backcountry - I wouldn't quite call it off-roading usually but there are definitely obstacles.

    I don't really know anything about transmissions, engines, etc., but it seems like there should be a better solution.
     
    Last edited: Oct 12, 2021
  18. Oct 12, 2021 at 10:31 AM
    #498
    ColoradoCub

    ColoradoCub [OP] New Member

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    A major disservice was done to Tundra owners by removing the cooler, everyone thinks it’s just a towing issue, not giving the transmission a single tool to cool itself is a problem in more circumstances than just towing. Slow maneuvering or travel in up and down terrain builds heat on the transmission quicker than towing, at least towing there is some air flow, not enough …but some. Slow moving in rough terrain is going to heat the trans up quick. Dumbest thing Toyota could have ever done!
     
  19. Oct 12, 2021 at 10:34 AM
    #499
    An701904

    An701904 New Member

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    If transmission failures start popping up do you guys think Toyota will TSB adding a coooler?
     
  20. Oct 12, 2021 at 10:37 AM
    #500
    realprotundra

    realprotundra Always Skeptical

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    The difference in trans temp alarms is a bit concerning. I was up over 260 numerous times and never got a trans temp warning.
     
    Jtundra81 and GTundraX like this.
  21. Oct 12, 2021 at 10:39 AM
    #501
    GTundraX

    GTundraX Rub some dirt on it.

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    There really should be - we all need to report our problems directly to Toyota! Hopefully we are still under warranty if/when that happens...
     
  22. Oct 12, 2021 at 10:41 AM
    #502
    GTundraX

    GTundraX Rub some dirt on it.

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    THIS is another thing! I cannot get a solid number on what to watch out for from other threads I've looked at. The ScanGauge should be reading codes directly from the system so we should all be seeing the same reading when the alarm goes off. Unfortunately, that's not the case.
     
  23. Oct 12, 2021 at 10:42 AM
    #503
    ColoradoCub

    ColoradoCub [OP] New Member

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    Nope! They would have to reverse course on that idiot engineers assessment a while back. They are willing to chance it on the toughness of the transmission in the tundras and figure true failures early on will be minimal to none. But for those that intend to own their trucks for a long time it will ultimately end up being on us to deal with it. How many times can this transmission experience 260 + deg before specific internal components start prematurely wearing or overheating is the question.(ie clutches, orings, seals,etc) We know that the first 12 years of Tundras never had to experience these temps, right? And anyone who says I’ll wait until the factory warranty expires before installing a cooler may very well be applying the fix after some damage is already done.
     
  24. Oct 12, 2021 at 10:52 AM
    #504
    hagrid

    hagrid Ich habe sie gespritzt

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    Good Lord, I hope not. Need to save money for fuel.
    Howz come no one is talking aboot the 260°F torque converter heating up the flex plate and the rear main crank seal?
     
  25. Oct 12, 2021 at 11:14 AM
    #505
    ultra1988

    ultra1988 New Member

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    Surprised at the lack of “Toyota knows more than you” posts on here. Last year when I posted about my ATF temps getting above 260f while towing a low profile 3500 pound boat I just walked away from the post because of all the Toyota fanboys who couldn’t handle negativity towards their brand.

    oil doesn’t hit a single temperature and go bad, it fails on a scale. The oil will fail faster at 240f then at 210f, and will fail a lot faster at 280f then at 240f. When lubricants fail, parts fail. Cst’s (viscosity) lowers with temperature. This issue is the only part of my 2019 that keeps me on the fence of getting rid of it. And now that I have bigger tires Toyota can void my transmission warranty.
     
    pickeledpigsfeet likes this.
  26. Oct 12, 2021 at 11:35 AM
    #506
    ColoradoCub

    ColoradoCub [OP] New Member

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    There was some of that going on earlier in this thread, the engineers holier than thou mentality BS. The fact that Toyota came out with a TSB a week or so ago regarding 19-21 Tundras getting the transmission overheating messages tells you all you need to know about the Engineers know best crowd! Common sense is common sense, for 12 years Toyota felt it was essential to have a transmission cooler on the Toyota Tundra, and then all of a sudden the last couple years of production they scrap it when they can no longer use existing designed parts and we’re planning on the debut of the newly designed tundra which has been delayed. Now we have a transmission overheating issue in the 19-21 Toyota Tundras, C’mon man!!!
     
    pickeledpigsfeet likes this.
  27. Oct 12, 2021 at 11:43 AM
    #507
    Oey12

    Oey12 New Member

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    Again if Toyota such a shitty product why not sell immediately? Clearly the 2019 to 2021 Tundra lacking a transmission cooler isn’t up to any tasks. Okay, great mock the Toyota fanboys all you want…you guys are still driving an inferior product based on your extensive knowledge and data. How is that not any dumber than being a Toyota fanboy?? Asking for a friend…
     
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  28. Oct 12, 2021 at 11:50 AM
    #508
    ColoradoCub

    ColoradoCub [OP] New Member

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    Sorry dude but that’s just a stupid post. Those of us who bought a 19-21 Tundra, bought the truck because of its reputation, I for one owned 3 previous Tundras. But not knowing that Toyota had eliminated such a critical component until after the purchase is quite frustrating. Being a fan boy is just childish, you own and spend your hard earned money for the best product for your use, and I am no fan boy of any brand. I’ll defend a good product that has served me well but will also always expose its weaknesses or inferior designs. You have to hold the brand accountable for its downfalls as well as it successes. This transmission debacle is not one of Toyota’s successes. Thankfully it’s easily remedied, no need to get rid of the truck.
     
  29. Oct 12, 2021 at 12:01 PM
    #509
    JDR76

    JDR76 New Member

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    Are you referring to me?
     
  30. Oct 12, 2021 at 12:07 PM
    #510
    Oey12

    Oey12 New Member

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    My post was meant to stupid and sarcastic…

    Toyota has a ton of downfalls however less than other manufacturers. I have owned many Toyota’s and have see all kinds of problems.

    But to constantly harp on it and refer to individuals who want more information on the subject prior to making a decision as fanboys is just as stupid and sarcastic…

    Not every owner here goes off-roading or tows at 75mph PERIOD

    Therefore it is not as crystal clear as the pro cooler members make it out to be.

    *EDIT* And we have no real data on the guys that do those things according to the manual like towing at 65mph max.

    I am a realist and I agree those number are high HOWEVER there are circumstances that will create high transmission temps in any transmission cooler installed ones as well.

    IE example:

    Speed

    At or near max capacity (payload and/or towing)

    Off-roading

    Ambient temperature

    Larger than stock tires due to weight
     
    Cpl_Punishment likes this.

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