2019 5.7 trans cooler location

I don't know if it's more effective i wonder if someone could track trans temps with the 2019 trans cooling system

 

Mine is usually in the 180/190s, but sometimes goes up to 210 not towing. Haven’t tested the 2018 while towing.

I think 07-early 10 had a separate trans cooler in front of the condensor. They changed it to integrate it with the condensor in mid 2010.

 

iirc, in some (many?) models including 2016:
There is heat exchanger to warm up the trans fluid. Trans fluid (coils) are passed through coolant to warm-up the trans fluid at startup or in cold weather. the heat exchanger is a separate unit and not part of the coolant radiator.

To cool the trans fluid, trans cooler (radiator) is used which is integrated on the top part of the coolant radiator. a thermostat controls the flow.

Sounds like 2019 (2018?) is no longer designed like the above!

 

Why would toyota change it old system seemed pretty good time will tell if new system works well

 

I've seen a regular radiator with inside cooling ,brand new at 250. The top mounted atf cooler and ac condenser are at 875. Unknown if r1234yf changed the size needed or to reduce costs.

 

https://www.tundras.com/threads/more-pink-milkshake.37875/#post-963653

Here is another post.

 

OK. I have examined my 019 transmission from underneath. The only lines attached to it are the warmer hoses filled with coolant. The warmer module does not have fitting for an auxiliary cooling like previous models. Therefore, addition of an aftermarket unit is not feasible, at least as I see it. Evidently, warmer is doing double duty by warming the fluid when cold, then extracting heat from it when it exceeds coolant temperature. Hope it works. My scan guage indicates the transmission oil roughly tracks coolant temperature when not towing. My truck is so new I have not driven aggressively or towed with it. Will keep you posted.
bc

 

Can you even call that a transmission cooler? False advertisement? Why would they remove something they already engineered that can only help in the long run. Yes, I’m not a Toyota engineer so I don’t know why it changed but I’m glad I got an 18. After my 2010, I swore I wouldn’t get another truck without a trans dipstick. But definitely won’t get a towing truck without a trans cooler.

 

Trans temps on my 17' mimic your observations on temp as well staying even with the coolant temp. They do rise past when I'm towing.

Could of been a cost cut measure, they added features like TSS so they have to delete things. Vehicles have been going this route for years now, it's a shame.

 

That doesn't sound good there are no lines going to the radiator ?the lines are now connected with the engine oil cooler that's what they mean by integrated

 

Guys, I discovered the mysterious missing trans cooler on my new ‘19 Pro after installing my Torque App and getting the PID’s right for the trans pan and TC outlet temps... immediately knew something was up, they run way too high even in no load, interstate cruising in 6th gear lockup they’re 15-25 degrees above engine op temps. That’s not right. And what’s worse is they’ll keep climbing on a 90 degree day on flat roads at 75 mph. It’s heat soaking. I’ve seen 225 after an hours drive no load!

Any kind of incline sends it soaring and it only partly recovers. Will be 2-3 degrees higher than the last time!

I have a new 30’ camper to haul to FLA next month and I’m NOT happy about this BS! I have started a formal case with Toyota NA and will report back as it is being escalated to tech.

My ‘17 Tacoma ran way cooler and recovered immediately upon going back into lock up. This one doesn’t.

 

Unfortunately I think they are going to say it’s normal. It sucks, but after the warranty is out you can try to retro fit the thermostat and a cooler on to yours.

 

What is your typical TC and pan Temp going 60mph on freeway?
Also what was your Tacoma temp?

 

Yeah, “it’s normal” isn’t gonna be an acceptable answer for me... as a fluid power engineer, I want an explanation not a brush off. This was obviously omitted where it was deemed necessary for the same application before.

Cruising at 60 it just depends on what was going on before. Which is part of the problem. I would say on average about 208-215f.

Tacoma would be engine temp no matter what so long as it was in lockup or park. So 198f of so...

The bigger issue is the fact that the Tundra has no method to disperse that additional heat when it’s introduced. I’ve watched this over and over. It just gets heat soaked. The Tacoma with a thermostat and external cooler never did this. Always came right back to engine temp.

 

Sucks I almost bought a used tundra because of tss then I get my 19 home and realize new freon and not what I would call a trans cooler and I tow quite a bit!

 

I wonder if the 2020s are the same as the 2019. I looked at the specs on Toyota's website and under tow package it says, "supplemental engine oil cooler, supplemental transmission cooler."

 

If they have installed them on the 2020, they should offer 019 owners some compensation toward a retrofit. Very unhappy with what is otherwise a great truck.
bc

 

Can anyone summarize here? I see talk of the coolant warmer to the transmission which sounds like it can also remove heat from the transmission, and, I also see talk of just interaction with an engine oil cooler. Speaking of, where is the engine oil cooler and how does its design work. Will it really remove heat from the transmission?

 

We need to get some 2020 owners to snap a pic of the cooler area of the trans. You can see it through the fenderwell.

 

Using scangauge, iirc the trans temp (TC and Pan) on my '16 at ~60mph is about 186-188°F. Seems like With the new design, you are reading 20-27°F higher! You would think Toyota knows what they are doing. I don't recall of any trans failure stories on this site! i've heard from Toyota techs that Tundra is designed to run in 180-220F range ... however I think GMC trucks run in 140-170F range! @ColoradoTJ may know the exact GMC numbers.
I prefer lower numbers as well but it's just based on what I've read here and there and not real engineering analysis and data.

 

the heat exchanger can heat the trans fluid but when the trans fluid temp is over the coolant temp, it will cool off the trans fluid. the floor would be the coolant temp. The part isn't that big so I'm not sure how quickly it can remove heat. I know if you are idling in park, it will raise the trans temp very slowly. My guess is that it is there more for its heating capabilities (e.g. Heating trans fluid in very cold temperatures) than for its cooling capability (e.g removing heat in hot summer towing) ... but that's just a guess!

As far as engine oil cooler, I like to know as well. I have no idea where it is located or what it looks like. It may have been discussed on this site but I don't recall now

 

2019s don’t have a trans thermostat to pin open. Just the coolant heater/cooler.

DirtE30, I’m on your side. I had a trans go out in my 2010 and lots of issues with the replacement til I traded it in. But Toyota isn’t going to tell you they screwed up and it should’ve had a cooler. The lawyers won’t let them. So any answer they give will be that’s how it’s supposed to operate.

Mine runs around 185-195 depending on how I drive it - like a grandma or like a rental car. Sometimes goes up to 200/205 on long hills. Haven’t towed since I got the BD to monitor temps.

 

I think it opens lower. Don’t know exactly what temp, but my hoses going to the cooler on my 2010 were warm after it got up to around 200. Can’t feel the 2018’s since the grill doesn’t raise with the hood anymore. I’ll try today after I get to work. It’s a 20 min drive and my trans is usually up to about 185 when I get there.

Also, for all the new 19 owners, I believe not all 5.7s in previous years had a cooler. Only ones with the tow package. I know no 19s have it and think it definitely should if it’s expected to tow 10k, but not having the cooler isn’t a completely new idea.

 

I predict fried trannys as miles rack up. Most owners just assume all is well and take Toyota's word for it. Early on I asked my dealer about this. Got company line: "If Toyota thought it was needed, it would have one". LOL.
bc

 

I think they removed them on purpose, they probably figured out that the percentage of guys actually towing is smaller then all the people who wanted push button start, carplay etc. To add those things and keep price and profit margin in line they make cuts to other things, usually the things you cant really see like the trans cooler.

 

I intend to add one if I can get a reliable tech to do it. Some dealers will do mods like this. A bracket to mount the cooler will need to be fabricated since there is not one for this model. A deep pan would be another option.
bc

 

early 2nd gens had a stand alone cooler, maybe you could retro fit parts from that year range to add onto yours to keep it OEM if your concerned about that.

 

That might work. A guy on another forum added a second cooler to his Gen3 for heavy towing. The mounting looked superb but I have not been able to contact him as to how he make it (or bought it).
bc