2019 tundra transmission thermostat location

Yeah, that me he’s talking about. We’ve been talking back and forth. He’s finding out some interesting info from the engineers.

 

Tim just commented that you took the truck in and the dealer didn't find an issue. Are you planning on adding an aftermarket cooler?

 

It's fraud. False Advertising. Ripe for a class action lawsuit. You paid for a Tow Package which includes a transmission cooler. You didn't get it and it runs hot and hotter when towing.

 

Not really fraud. The transmission still has a cooler. It has a coolant/oil heat exchanger rather than a air/oil heat exchanger but a heat exchanger never the less.

 

BS to that. You paid for something extra to help endure towing and you got stock instead. Misrepresentation in a financial transaction.

 

...and you got a tranny cooler, it just doesn't perform the way you think it should. I'm pretty sure the Toyota lawyers would have looked at any liability but feel free to talk to your lawyer about it. Hope you have deep pockets.

 

So what your saying is: If your a big enough bully, you can defraud anyone, with no consequences.

 

It may not be fraud but it was definitely on the shady side.

 

Welcome to the real world.

 

Definitely shady.

 

I have one ordered and its all OEM parts, so Toyota won’t be able to come at me if a warranty issue comes up.

 

That’s the thing, I didn’t know they removed it. It still says on the sticker that it’s there.

 

I’m married to my lawyer and she said the same thing as you. I’m still adding another REAL cooler.

 

One is there according to Toyota. The cooler they reference is the old “warmer” that uses engine coolant. They technically didn’t lie about it.

 

I have a 2015 Tundra 4.6. Does not have a trans cooler, only heat exchanger. IfI have some ideas after looking at the heat exchanger. Can I disconnect the coolant lines and connect them together to bypass the exchanger. Take the trans fluid line that feeds the exchanger and extend it to a front mount aux cooler. Then run a return like from cooler to where the exit line for the exchanger went into the trans. There are 90 elbows coming out of the trans feeding fluid to the exchanger. They make block off kits for Dodge diesels to block or bypass the exchanger and only use the aux cooler. Had one on mine. Cooled the trans a lot better with out the exchanger. Never got to cold in the winter. Our Cherokee has 2 small aux coolers and never gets to cold in the winter. My Chevelle never gets to cold, on colder days. Here is a pic from a different model. But mine looks the same. Please let me know if this is possible or anyone else has done this.

 

If you read one of the 3 threads you posted this in, there was already talk about it. I forgot which thread though.

 

I've read so many posts on all different forums. It's all scrambles in my brain now! I will go back and look. Thanks!

 

I think the consensus was it probably wouldn’t do anything, but if you find the post you can ask the guy if he ever tried it. I forgot who it was.

 

Hmmm. It's hard to believe it wouldn't do anything. Especially since you would be bypassing the heat exchanger and running the fluid through an auxiliary cooler. I know on my past and current vehicles it works. The trans fluid will almost always stay at what the coolant temp is, or hotter. I think the heat exchanger is just a way to increase mpg due to the thinner oil. That way Toyota can sell trucks. They don't care about the live of the fluid. Especially since they say you have to use their fluid in the trans.

An aux cooler with a fan mounted in front of the radiator would surely cool the fluid better than 200 degree coolant. I know coolant (fluid) carries heat away very well. But, 200 degree coolant is not going to keep a trans at 175 degrees. Mine is a steady 200-215 once everything is up to temp. It was in the 240s a few times pulling my single axle 16ft empty trailer on a county road. That isn't good.

 

Since coolent is what’s running through those lines you would also need some sort of coolent pump for circulation to the cooler. The belt driven water pump is what is currently pushing fluid through the warmer/cooler puck.

 

Check this thread. There is talk about it starting around page 6. They even mentioned adding a heater core I guess to cool the fluid.

https://www.tundras.com/threads/install-complete-on-additional-transmission-cooler.12385/page-7

 

Coolant running through which lines? The bigger lines are coolant.I want to disconnect those from the heat exchanger and connect the ends together. Just like bypassing a heater core. Coolant would just make a big loop and go back to the engine. The two smaller lines are trans fluid. One exits the trans to the heat exchanger, the other exits exchanger and enters trans. No coolant is flowing through the trans.

 

Yes those are coolent lines that come from the engine cooling circuit from so where around the back of the block, they are not filled with atf. I thought about adding in a small fluid cooler with electric pump and fan somewhere under the truck but I decided the factory setup is tried and true and would rather install oem parts.

 

I just did a second take on your picture I didn’t notice the factory thermostat. I was under the impression that the 4.7 didn’t have that thermostat. So you are correct about adding a cooler in the smaller lines. But why disconnect the warmer at that point? Getting you trans up to temp sooner will be better for the longevity and economy. I would add the cooler and leave the warmer installed.

 

I don't want the coolant lines having anything to do with the transmission. That's why I want to disconnect them and and clamp each end to a piece of hard pipe to loop it right back to the engine. Then, disconnect the small line coming off the trans that feeds trans fluid into the warmer, pick, heat exchanger, whatever you wanna call it. Run that line to an auxiliary cooler. Run a line from cooler back to the other small line that fluid leaves the exchanger to return to the trans. This way the exchanger would do absolutely nothing. I really don't even have to disconnect the coolant lines since the trans fluid won't be going through the exchanger any longer.

 

My thinking is on 3 other vehicles, I have never had a problem with the trans fluid getting to temp when it's cold out. Trans fluid does not like heat. 175 is optimal. Heat is terrible on clutches. No way should trans temp be 200-215 while locked up going 65. My Chevelle with a 3 speed and high stall non lock up TC runs cooler than my tundra. Toyota wanted thin hot fluid for less friction to help fuel economy. I want long trans life. Guess I will try it and see what the ultragauge says.

 

And I do agree with you. I could leave the coolant lines hooked up. There are several ways to route the trans fluid lines. Into the warmer first, out to aux cooler, back to the trans. That works fine and that's how almost every aux cooler is ran. Through rad first then to cooler, then to trans. That's mainly for getting the trans to temp quicker on colder days. That's how our coolers in our Cherokee are hooked up. It has a Toyota trans. On my Cummins, I got rid of the heat exchanger all together. All it did was add heat to an already hot trans. Bypassed it and ran straight to aux cooler that had a thermostat built in. Ended up bypassing the thermostat valve and trans stayed at a steady temp. Chevelle is straight to the cooler with a fan. I'm only going off my past experience. But, I think it would be easier to keep the coolant lines hooked up since the cooler I have is one of the larger one BM makes. Plus it has a fan.