19-20 Discussion on Missing Ambient Cooler

You have to remember that what we do in the "backyard" and throwing a cooler together is not something Toyota can do. Designers and engineers have to be involved and then testing to make sure that its sound. A simple add on takes time and huge dollars. If it can be removed to save money and complexity it would be especially if there is no adverse effects on the normal operation of the truck.

I was one of those that was planning to buy the new 2020 Tundra when it came out. 2020 rolled around and nothing. Because of the delays in bring out the new Tundra I got suspicious thinking they may be having issues. I decided I didn't want to take a chance on the first model year so purchased the the old reliable design. As far as inside info Toyota doesn't tell their techs anything. The info I got on the New Tundra that was suppose to be out in 2020 was from the dealer principle. He came back from one of the regional dealer meeting to tell me the new Tundra was coming out in 2020.

 

They are not reinventing the wheel!

The same transmission has used external cooler before! It's rock solid technology!

To adapt your quote: "Designers and engineers have to be involved and then testing to make sure that its sound. A simple REMOVAL OF A PART takes time and huge dollars." They must have spent a good amount of money to make sure it gets at least through standard warranty period...

All things considered you stay with tried an true technology and don't mess with what works..

Obviously ATF coolers are a weak spot in Toyota engineers book. From pink milkshakes to combining with AC condenser to removal...meanwhile the rest of the industry uses a tried and true external cooler.....

I've yet to read of an issue with external coolers...perhaps I missed them but since the Tundra TRD OFF ROAD is conceivably designed for OFF ROAD use not to mention towing....a robust ATF cooler de rigueur!

 

Were you talking to someone? Or did you leave a message?

 

Yay!! Its back!

 

And what was their response?

 

Toyota would never had changed anything if they could have left it alone but because of regulations that forced the use of R1234YF the ambient cooler had to be removed.

 

I've seen 243° with an empty trailer going up a long hill. So wtf????

 

Remember, Roy G. just answers emails. He isn’t the engineer that removed the cooler. Not sure what manual he got 221 from, but others on here said that wasn’t the upper limit. Light doesn’t even come on until 302. I’ve seen over 221 with mine with cooler pulling a load up a long hill.

 

My question is this - under what circumstance would the transmission operate at 68*F? That makes no sense.

 

If that’s correct, then every tundra is overheating. Even ones with coolers. And that would be more reason for them to not have removed the cooler.

Thanks for posting the email. But I don’t put a lot of faith in Roy’s answer.

 

The Fussion app readings for the pan and TC are correct. I've compared them using Techstream.

 

Well the truck is going in today for a steering issue , so I will inquire and see what they say. I hate getting caught up in hype, speculation and unsubstantiated facts , but I keep my vehicles a long time and put on some mileage. So it might be a worthy investment???

 

Service writer was clueless, as was the assistant service manager. The question was put to me, "why would you need to add to what is already there"? My response, why wouldn't you want to book a thousand dollar service??

 

Lol at the 68-221f operating range.

Mine never had a trailer connected to it and easily exceeded that.

 

That 68-221 sounds like the trouble code parameters mentioned in the other now locked Transmission Cooler Missing thread that the original poster was taking as the operating temps.

 

Most service writers are clueless. It's a job nobody wants and most don't last to long in the position.

 

Read post #75 above... it looks like this info came straight from Toyota Customer Service.

 

I understand it came from Toyota rep. I think he got the information from the same place @Ruggybuggy pulled this information about a trouble code.

A couple of posters in multiple threads have misinterpreted this code for the normal operating temps when it obviously isn’t. I don’t think it is coincidence that the temperatures for the trouble code as well as the reps response are the same. It seems like a misinterpretation on the reps part

https://www.tundras.com/threads/2019-2020-transmission-cooler-missing.72484/#post-1861105

 

And that code just refers to a defective sensor. Nothing indicative of temp fluid I believe.

 

Exactly. Pretty much everyone has had trans temps over 221 at some point more than likely if they don’t have the cooler so there’s no way that’s the top operating temp for normal

 

And if it was then that’s when the overheat light would come on. But it comes on at 302, 81 degrees higher.

 

Toyota Customer Experience Center, WTF is that??? Cut and dry disclaimer about modifying and or using non Yota parts, where he go those numbers from is anybody's guess.

 

Ill bet that 221 temp is based on the 18 and older trucks WITH a cooler... since mine wont even get near 200 after adding the cooler.

Toyota probably changed the warning light trigger and "normal operating temperature" window on the 19/20 trucks.

 

Once your ScanGuage is updated, you can see your tire pressures as well. I need to update mine.

 

Speaking of which, I received a brand new ScanGaugeII back from them today! The buttons are different. Can't wait to play with it this weekend - too much going on with work right now.

 

I wonder if I would get a new one back if I sent mine in. Snap a pic of it when you get a chance.

 

Do you take the temp at the same place as Toyota engineers? Do you use a mean or median average? How many data points?
I just got through conducting a noise test on a hydrostatic drive system. Lol I didn't just take a db meter and take one data point. I spent weeks designing the test. I took a total of 942 readings for one set of conditions. My conditions consisted of temp, rpm, ambient noise, oil viscosity, type of oil, etc.
I ran 27 different conditions of 942 db readings. I can guarantee you my tests don't hold a candle to Toyota's test parameters. We simply cannot do things on the scale they do.
My point is you have one data point. They have millions.

 

You should've come out my way and sampled my BX23S roaming aboot the yard cutting grass.

The result of your testing would = f'ing loud.

 

All I said is I’ve seen over 221 and didn’t get an overheat light. Why don’t you go to the lift threads and tell those people how wrong they are for messing with Toyota’s “millions” of data points by changing their suspension? Or those who switch their lights to LEDs? Hell, I added an A.R.E. cap. I guess thats wrong cause Toyota didn’t add it at the factory and I didn’t test the new aerodynamics with millions of data points.

Your posts have added nothing to this discussion. If people want to add a cooler with their money, good for them. They’ll deal with the consequences. I don’t get why you care so much. And we get it. You’re an engineer. You like to point that out in every post. But you could be a train engineer for all we know.