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A/T High Temperature Warning Pulling Offroad Teardrop?

Discussion in 'Towing & Hauling' started by jpbewley, Sep 3, 2019.

  1. Sep 6, 2019 at 10:54 AM
    #31
    CO_Native

    CO_Native New Member

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    Where did you find this information?
     
  2. Sep 6, 2019 at 10:58 AM
    #32
    blaserdude

    blaserdude New Member

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    They describe it as integrated engine/transmission oil cooling. Basically, it uses the coolant to extract heat. A step backward IMHO. That was the way older vehicles cooled the trans. I looked at the system (as have many of us on this forum) and quickly determined the lack of auxiliary cooling or a takeoff for adding one.
     
  3. Sep 6, 2019 at 11:32 AM
    #33
    blaserdude

    blaserdude New Member

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    That said, I may risk my warranty on the transmission if I can find a reputable shop to install a system. The dealer would not comment on installing one.
    bc
     
  4. Oct 22, 2019 at 3:41 AM
    #34
    georgie

    georgie New Member

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    Just a guess could the trans be starving for fluid ? I mean your in reverse up a steep grade !
     
  5. Oct 22, 2019 at 4:38 AM
    #35
    jpbewley

    jpbewley [OP] New Member

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    I had it happen again this weekend. Same teardrop trailer, different hill. This hill wasn't that steep. I'm wondering if it's just my Tundra. Its pretty clear that if I'm going to back up something with a trailer - I'm always going to have to use 4lo
     
  6. Oct 22, 2019 at 4:45 AM
    #36
    marinakorp

    marinakorp New Member

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    Happened on my silverado - with a tranny cooler (etc).

    Not that steep of a driveway, the last few feet was a slight incline more than the rest of the driveway. Temp was climbing..

    was recommended to put in to 4lo - I was skeptical - but it went up it with no issue. no heat build up afterwards.

    If backing for a short distance - will use the regular gearing. if there is an incline, get most of the way there, then do 4 lo for the rest.
     
  7. Oct 22, 2019 at 5:11 AM
    #37
    ColoradoTJ

    ColoradoTJ Certified tow LEO Staff Member

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    This was a common problem in the diesel forums as well.

    In reverse, there’s a lack of air flow through the cooling system, however not having a cooler up front anymore is unfortunate.

    This is what we would do if owning a HD diesel with an automatic in reverse under heavy load:

    - Turn on AC or defrost. This would lock the clutch fan and give maximum air flow.

    - Reverse heavy loads in 4Lo. Do not do this on pavement. Great way to explode some drivetrain components.

    Now I don’t think the Tundra has this feature other than a thermal operated clutch fan, not that it would matter anyway without a front mounted cooler.

    I would take your truck in for a fluid level/condition check. The high temp alarm coming on backing up a teardrop trailer is ridiculous.

    I may have to eat some crow on my comments about the 2019-20 trucks not having trans coolers up front anymore.
     
    Hbjeff and FirstGenVol like this.
  8. Oct 22, 2019 at 7:24 PM
    #38
    jpbewley

    jpbewley [OP] New Member

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    I agree with you. I can back the trailer up the same driveway all day long in my FJ cruiser. My Tacoma also had no problem. Feeling like my brand new Tundra with less than 4,000 miles needs to go to the toyota dealership for an inspection....
     
    ColoradoTJ[QUOTED] likes this.
  9. Oct 23, 2019 at 5:25 AM
    #39
    blaserdude

    blaserdude New Member

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    We owners need to keep hammering our dealers about this. It might lead to an actual solution from Toyota.
    bc
     
  10. Oct 23, 2019 at 6:02 AM
    #40
    Eric32444

    Eric32444 "Pick up your balls and load up your cannons..."

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    love the secondary cooling system idea...would love to know how efficient this might be at cooling ATF.... currently thinking about mocking this up myself....i need some time off from work...
     
  11. Oct 23, 2019 at 6:25 AM
    #41
    Mike19

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    I guess this is another way the stealership makes money to have you go in more frequently to get a ATF change.
     
  12. Nov 3, 2019 at 8:33 AM
    #42
    Badger Co-Op

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    Is anybody sending off to an analyzer? Is this even an option with ATF yet?
     
  13. Nov 3, 2019 at 1:30 PM
    #43
    AZBoatHauler

    AZBoatHauler SSEM#140/ASCM#3/2ndGenNaysayer/BAF140

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    Yes, Blackstone (and others) will do an analysis on ATF.
     
  14. Aug 7, 2020 at 7:18 AM
    #44
    GroovDog2

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    I pull a 29’ travel trailer and never had this issue with my 2017 Tundra. Now I have the same truck, but a ‘20 and I’ve gotten that light 3 times now, going forward. I ordered an A/T Cooler and will install it in a couple of weeks. In the meantime, I’ve added an OBD2 module and the OBD Fusion app and monitor my temps. There’s no way in hell that Toyota could’ve made a dumber decision with their engineering.

    This was on flat ground going to the coast, with the trailer...
    IMG-7701.jpg

    This is after I added an OBD2 module and OBD Fusion app. Slight incline at 70 mph. No trailer.
    IMG-7695.jpg
     
    Last edited: Aug 7, 2020
  15. Aug 7, 2020 at 7:42 AM
    #45
    FirstGenVol

    FirstGenVol Brake Czar

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    Wow. That's high. You're going to want to do frequent transmission drain+fill's at that rate. With only 900 miles you may want to back off on towing until the truck is broken in.. Not sure what the break in period is for 2020's though.
     
  16. Aug 7, 2020 at 8:16 AM
    #46
    Grendel

    Grendel New Member

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    I have a 2016 TRD PRO and tow a off-road tear drop. I haven't had any problems towing in Cali/Arizona. My temps with towing and without towing usually sit in the 190s (Superguage) But a little preventative bolt-ons aren't a bad thing. So now my question.

    SDHQ has a AB60 transmission pan it adds a few quarts of fluid and supposedly keeps it cooler.

    1. Would this be a good investment or is it snake oil or not worth the time/effort with little return(ie CAI)
    2. I heard that removing the pan is a pain and not worth the time (changing filter etc.) would it be worth it to change to a more efficient pan?
    3. Would an additional cooler be a better investment?
     
  17. Aug 7, 2020 at 8:56 AM
    #47
    19crewmaxTRD

    19crewmaxTRD Tundra Enthusiast

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    You can use the fusion obd app to monitor torque converter lock up. Pulling my trailer I switch to 4th or 5th to get the torque converter to lock up and keep the transmission temps down. Sucks that you have to do that but it does work.
     
  18. Aug 7, 2020 at 9:02 AM
    #48
    GroovDog2

    GroovDog2 New Member

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    I'm at 6500 miles now and I just think that the temps are way to high, towing or not. I have a transmission oil cooler kit coming in soon. It's supposed to put my temps back down where they're supposed to be.
     
    FirstGenVol[QUOTED] likes this.
  19. Aug 7, 2020 at 9:05 AM
    #49
    GroovDog2

    GroovDog2 New Member

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    This is the guy I went with. Lots of R&D went into this set up...
    https://www.tundras.com/threads/2019-transmission-cooler.60550/
     
    sask3m likes this.
  20. Oct 2, 2020 at 8:10 PM
    #50
    Petergoose1

    Petergoose1 New Member

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    I have a 2020 trd pro with about 8000 miles. Towing a 3500 21ft camper, 4500 with cargo passengers and such. Ive towed it probably 2000 of those miles hwys, mtns, backroads. Just had to back about 20ft up a fairly steep hill for a campsite. The tranny fluid light came on and I continued to back up and adjust the trailer for about 10 min (not constant pedal pressure) any hoo- kinda surprised and began to search-- anyone who did the cooler- did it fix it? Going to change the fluid and oil asap, but really, wth? 55k truck with tried and true drivetrain? I hope so
     
  21. Oct 2, 2020 at 8:14 PM
    #51
    Green Thunder

    Green Thunder Smooth in the Cruise

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    Keep searching...there are quite a few threads on this topic here
     
    Petergoose1[QUOTED] likes this.

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