Any AB60F experts in the forum?

Greetings,
I would like to hear from someone who knows how the integrated trans cooler on the 2019 actually works. Is the coolant thermostat controlled to flow at a certain oil temp? Can an oil/air cooler be added? Are there oil takeoff ports other than the warmer adapter? My 2019 definitely runs hotter than my 08 with the cooler. I have been pulling my ATV/trailer around the Carolina/East TN mountains. The oil heats up when going up grades as expected but does not seem to cool very quickly like my old truck did.
Thanks,
bc

 

Far from an expert, but I do have a Toyota document that explains how the warmer/cooler mounted on the transmission works in the simplest terms. There are a lot of illustrations, but impossible for me to copy and post. Probably easiest to cut and paste what they say:

Models with ATF Cooler
When the ATF is at a low temperature, it is warmed up by the engine coolant in the ATF warmer.
When the ATF is at a high temperature, it flows to the ATF warmer and then to the ATF cooler, thus it
is cooled down.

Toyota calls the transmission-mounted auxiliary warmer/cooler an "ATF Cooler"at the time of this document, but actually the part on the transmission is a warmer with a thermostat (that part that you pin when you change the fluid). Up through 2018, at least, once the fluid reached set temp, the thermostat diverted the fluid flow to the air to fluid cooler up front. That is...up through 2018.

I read a forum post recently that claimed his 2019 had NO air to fluid cooler up front. It would be easy enough for you to crawl under and see if there are two lines off the auxiliary warmer/cooler headed up to the front of the truck.

As far as the thermostat set temperature, this is a kindergarten level document, and the set point where the flow is diverted is not given. It possible that the design has been changed, and/or the set temp raised, but that is all well past my knowledge.

 

Thanks. I have read that document. The 2019 has no oil/air cooler like previous models and runs hotter than my old one which did. It will be interesting to see what those who pull campers and other heavy loads observe. I am looking into installing a system on mine but need some expertise on feasibility.
Regards,
bc

 

Not sure what AB60F expertise you need.

All you need to know is "Will the pump put up enough pressure and volume to pump fluid to the front of the truck and back, and still maintain full transmission function?" That has already been established by cooler configurations before 2019. Worst case (and probably the most expensive) would be to simply use 2018 parts to retrofit your transmission to the 2018 cooler configuration as another forum poster suggested.

I did a little research on this, and there are aftermarket coolers already being offered for 2019+ Tundra. Whichever route you take, I personally would try to retain the thermostatic control of previous Tundra versions. Toyota before has seemed to be concerned about controlling fluid temperature. Not sure what happened for 2019, but I highly doubt the clutch materials are any different (Now that's an idea for a Google challenge!). I didn't see any of the aftermarket cooler versions offering thermostatic control, but I didn't dig too deep.

 

Thermostat Unit - Toyota (32970-34030) is the takeoff that's needed. The catalog states will fit 2019. What coolers did you find? Not too much listed for the new model yet. The challenge is to find qualified installer and not void lifetime warranty on trans. Going to talk to my dealer soon.
thanks,
bc

 

Like I said, I didn't do an in-depth study. From etrailer.com, Derale Series 8000, generic cooler and installation instructions. No thermostatic control. Recommended to use as secondary cooler in series out of radiator (preferred), no instructions given for standalone cooler with supply/return tubes from transmission.

https://www.etrailer.com/Transmission-Coolers/Toyota/Tundra/2019/D13503.html?vehicleID=20194041690

 

I'll bet they aren't aware that the 2019 doesn't have oil takeoff like the 2018 and earlier models. I left a message with my service manager about the new cooling method. Has not called back.
bc