2019 5.7 trans cooler location

I'll chime in...
My previous 2012 (with tow package and trans cooler... and trans temp gauge) never had an increase in temps, towing or not.

My new 2019 (with towing package, which says it has trans cooler.... but no temp gauge) gave me a "trans high temp" warning when towing a ~6000 lb trailer at 70 mph on rolling hills after 1.5 hours. The warning went away after about 10 miles.

 

Previous models have the coolant lines. Toyota even calls it a warmer in some manuals. If you start your truck and let it idle, the atf will warm up just sitting there. Then tow packages also got a cooler that atf ran through.

The 19s only have the coolant “warmer” that is supposed to also act as a cooler. The atf lines to the cooler integrated with the ac condenser went away, even with the tow package.

I agree why remove it if they thought it was needed before. Does it not really need it or to save $? I’m more cautious and would rather have one. What if they said technically an engine can handle 400f so we are removing the radiator and fan? Those going 2 miles at 30 mph wouldn’t notice, but others would. If they say atf cooler I’d expect an atf cooler.

 

I'm not disagreeing with what you said overall but all atf warms up while the engine is running. In fact, if you change your atf you'll find it only takes a minute or two till the atf gets up to temp to test. It will get 140 plus just idling from cold start.

 

Were you towing on drive ? I noticed if I tow on s4 I keep the temp 215 average , as soon as I use drive D it just crawl up

 

I was in S Mode and cruise control off; and using the momentum going down hills to assist in going up the next hill. So I was actually doing everything possible to help the transmission while traveling the speeds I wanted.

 

Interesting, maybe 70 was too much , I usually tow s4 and 55 to 60mph highway and hills towing 4500lb and averaged 217 on hills and 215 highway , never got warning light and that with outside temp near 90 .

 

Okay I went and looked at a few on the dealer lot. This what I believe is going on. All the parts catalogs are wrong. Even Toyota's primary parts website. I looked at (3) 5.7s with the towing package. None of them had the lines that run forward from transmission to the "air cooler" In fact, the transmission doesn't even have the place on the transmission to add the towing package parts. Its gone completely. The integrated air cooler a/c condenser isn't being used. The part # for the integrated air cooler/ac condensor is 88350-0C010 and shows as being applicable for the 2019. The part # for just the AC Condensor without the transmission lines is 88460-0C100. They are both the same size and can be used interchangeably. I believe that is what they're using on all of the engines now.

Either way the parts catalogs can't be right.

The stickers on all the trucks I looked at said on a separate line "Eng/Trans Fluid Coolers".

I suppose this is technically accurate. The transmission and engines is being cooled by the radiator but there is no air cooler.

I can't say for sure the A/C condenser didn't have some line running somewhere but they would have to big enough to handle the volume of fluid necessary. There wasn't such a thing anywhere on the condenser. Which makes me believe they're just using 88350-0C100 or they would have issued a different part #.

Just my penny.

 

Were they all 2019 or 2020 trucks , just checking to see if this change in 2019 carried over to 2020 which I would think it did

 

I know one of them was a 2020 Barcelona Red. There other two were white but I didn't pay attention to the year. They looked the same

 

I think "trans cooler" doesn't necessarily have to have a radiator (like older models) since a heat exchanger will cool the fluid when hot and will also warm up the fluid when cold. Like @sundance said, and technically speaking the sticker is not inaccurate. However since some parts (trans fluid radiator & thermostat) have been eliminated, I can see people getting upset since they compare it with previous year models.

 

I think that was the discussion in this thread. The 19 owners already confirmed there was no atf radiator. Second was the potentially misleading (not flat out wrong) window sticker that says trans cooler when 5.7s with tow package for 12 years (07-18) did have a cooler.

I don’t think anyone thought the catalog was wrong. The issue is why remove the ac/trans cooler part that was in previous models.

 

They were claim there was no cooling and some warmer was in place. That was my problem with what they were saying. I know better. I provided the evidence that Toyota has long cooled the transmission regardless of existence of an air cooler or not. When someone says something like this, it makes me question what else they're saying. There have been others that said they saw an air cooler on the 2020. Just confirming.

 

Is this the cooler?

 

Yes. Previously, on tow package vehicles, there was also lines that attached above this unit (with a thermostat) that moved the ATF to the combined ATF OIL/AC Condensor air cooler in front of the radiator. Toyota called this an "Air Cooler".

From 2007 to 2010 with tow packages, there was a dedicated air cooler. In 2010 they combined the Air Conditioning Condenser radiator with the air cooler of the ATF. Which is a very expensive part. The combined air cooler for ATF /AC is about $1000.

Now it looks to me they are only using a AC Condensor not a combines air cooler for the ATF. That part is much cheaper. Like $400.

I don't know what to think of the choice. I'm sure its was cost cutting to some degree.

Personally, I believe the transmission can handle the temps that is being reported with the new system but I'm not an expert. I have seen others manufactures saying 240 is good.

 

Is anyone working on how to “upgrade” this back to how it was?

 

I'm going to look closely at my 14 later and see if you might be able to use the old parts or not. I believe the porting is gone but want to make sure.

 

Thanks for looking

 

is the trans fluid air cooler/radiator for the 2010 (to 2018?) On top of the coolant/water radiator? Are they basically stacked on top of each other. Like trans air cooler at the top, and the ac condenser in the middle , then the coolant radiator at the bottom?

You mentioned trans fluid cooler and ac condenser are combined ... Is it a one piece/part radiator with 4 lines (2 for each) on the top of the main water radiator?

 

Right next to the red hot exhaust...

 

By S mode you mean you were in 4th? You can be in S and 5 or 6 ...
I can see fluid heating up in 6th while towing and going fast and/or uphill. but in 4th it shouldn't! Also 5th and flat I wouldn't expect it to get hot either.

 

Is the scan gauge the one to get to monitor my temps for this, or is there a better one? I thought I saw a YouTube video with on that integrates with the drivers vent

 

I actually believe the cat is much closer on my 14. I had a hard time getting pics because of it.

 

Its the black radiator in front for the 07-18s with tow package. ATF on top and ac condenser on bottom. ATF lines go in and out on the passenger side and ac lines on drivers side. Engine radiator is behind it. SC inter cooler in front of it.

 

To qualify for its J2807 tow rating, the truck has to go up Davis Dam (12% grade) pulling its rated trailer weight (9000ish lbs) at a minimum of 40 mph in 110F heat with the A/C running at maximum. https://fifthwheelst.com/SAE-J2807-Tow-Tests.html

Any warning lights during the climb would fail the test.

uh oh

 

Doesn't it also have to go up that ramp on fire?

Found it:
https://m.youtube.com/watch?v=ln0KY7PQKrk

 

In the old design, you can see from the two photos attached, that there are ports in the side transmission that the water cooler doesn't share with the air cooler...

There are no such ports in the transmission. Nor are there any covers over the ports in any of the trucks I looked at and I haven't seen any in any of the pictures I've seen.

I don't see how you can add the external air cooler using the old parts or an aftermarket product. No external ports or lines to carry the fluid.

 

I’ve been impressed with my truck so far. I will have to get a gauge to monitor the temps and change the fluid more often if I need to.

 

Hopefully there is some way to add the part with the trans lines back to the transmission if needed. Probably screw the warranty though.

 

Here ya go fellas. In black and white. Hardware side by side comparison as well as temps.

https://youtu.be/JekojvXfpVI

 

I think the issue is worth a "Toyota" explanation. However, you should stop saying its missing a transmission cooler. Its not missing a transmission cooler. It no longer has the air cooler. It still has the oil cooler that cools via the radiator.

Even the transmissions without the towing packages have long had a transmission cooler.