2019 5.7 trans cooler location

I bet it does act like a bobble doll...

 

Please see post 217. A poll on an Internet forum is worthless.

 

The hose coming from my trans to the air cooler on my 18 is hot when the trans gets to about 194. I haven’t heavily towed long distances, but at one point Toyota thought around 194 is the temp that it should start cooling. My engine temps run around 195-200.

 

52F outside, cruising at 40mpg and coolant is normal and trans is 210F at the pan. My 08 never ran this high even with a trailer.

 

Who you talking to?

 

On my 2010 - just completed a trip from one side of PA to the other - approx 600 miles. 75 Mph, cruise in "D"
My temps were between 190 and 200 for the most of the trip...sometimes 195 for a long stretch.

Ambient temp made a relatively little difference in the Trans / Coolant temp...they were consistently "close enough" for the trip...sometimes 185...190...195...but both were approx close enough..never saw the coolant at 180 while the trans was 200...maybe a 10 degree difference for a short period of time.

I also did a short run - 60 miles or so - in S4 Tow haul and 65-70 for the entire time (basically mimicking what I would be doing when towing my RV. My trans and coolant were also UNDER 200 (195 or so) for the trip.

 

Do you have any numbers while towing ?

 

Not at this time. My Trailer is in the shop for a Tree branch issue. will tow it home in the next month (hopefully) but is all back roads, and no real highway for any period of time.
I basically wanted to get my baseline of what is "normal" for driving, and then make the comparisons...so I wont be freaked if I see 210 (or whatever) when towing in S4 at 65 (or so) -and wanted to baseline that temp - pretty close to just leaving it in "D" but less fluctuation...just stayed under 200...

my 2000 Silverado had a temp gauge with real numbers - and was easier to view / monitor from the beginning. RARELY did it ever get above the normal operating temp of BELOW 210 ... even in 100 degree humid weather towing 7,000 lbs.

I didnt get the BD tuner till recently (on my new to me Tundra) till a few weeks ago. So, I have nothing to compare with "concrete" numbers...but the needle was pretty close towing as was "normal" operations when I did tow the trailer with the Tundra.

Ill post back later with numbers...

 

I had a 2010 and felt the needle didn’t mean much. It stayed in the middle between about 160 and 240. Pretty big range, which is probably “normal”. Seems like its the same as a warning light cause when it moved up then it wasn’t long until overheating. I like a digital gauge and actual numbers better so I got a BD.

 

iirc, with my '16, scangauge would read 186-192°F under same conditions you described. Not much over 190F if that. So 210F (for newer models) is about 20F higher.

Sounds like without air cooler (atf radiator) you should typically expect 20-35°F higher atf temperatures. I won't even be surprised if it increases to +40-45°F under some towing conditions.

 

Nope stays around 215 even when towing

 

Good news then!

 

I towed my 23’ 7k trailer and was seeing 240 on a all day trip on flatish highways. It would dip to 215 when coasting downhill. 85F and in S4 and tow/haul mode with AC on. I am concerned about next summer when you can tow for 8 hours straight in 100F. IMO after it gets heat soaked, the current setup just cant shed enough heat. After a long run, while sitting at idle like at a gas station, the temp barely dropped. Whereas coolant temps would drop whenever the fan clutch kicked in or sitting at idle. Next summer we will be seeing lots of other peoples temps and be able to make a better analysis.

Should mention that I am not too worried yet. It does suck that my v6 toyota trucks/4runners/early Tundras all came with separate coolers, and my actual tow rig dosent.

 

It will be interesting to see the color of the fluid after some miles at the higher temps. Mine runs around 215 but I don't tow heavy. Long runs like I make concern me though.
bc

 

FWIW according to the old detail sheets for our transmissions I have saved somewhere, if I read it right in D/S5/S6 there is no converter lockup in 4th gear. However in S4 it will give lockup in 4th. Maybe a short term workaround for someone going down the freeway in D with a trailer and the light pops up.

So basically fermentedboarshoof ran in coolest possible mode

according to this site, GM allows up to 270F with spikes to 285F in the sump https://www.silveradosierra.com/transmission/maximum-tranny-temp-t1877.html

Who knows. I wish Toyota would give an official statement on the thing. I know one thing, with a heavy trailer the WS turned soot black and started banging shifts about every 15-20k miles (on a truck with the cooler), but the synth maxlife hasn't changed color at all in the 25k since it was switched. That truck is long out of warranty though.

edit: heavy = 8600# with only about 5k of the 15-20k annual miles with the trailer

 

There^^^. And, this is a 2016 WITH the cooler up front. It was important enough to read again imo. Questioning WS fluid's temperature resistance was how I got started in this thread.

If my truck was a 2019 and I towed with it, I would definitely change to a full synthetic fluid, preferably advertised as WS rated, change it frequently, send off oil analysis samples after every change, and revise the change interval accordingly. If the synthetic fluid couldn't manage the service, I would retrofit the pre-2019 thermostat assembly to the truck, and install hard lines to a pre-2011 stand-alone cooler up front. The Toyota stand-alone cooler will be more expensive than aftermarket, but it was specifically engineered for the heat load of the transmission under towing conditions. JMHO.

And, that's all I have to say about this.

 

I towed around 7 times this summer my travel trailer , I would say between 4200 to 4500 pounds , I usually drive around 3 hours one way going from Massachusetts to new Hampshire and Vermont, definitely run against some hills and the most I saw is 217 on the pan , and that with 90 degrees outside , driving 60mph , S4 , tow haul and AC off (whenever I go up hills) . I have seen 230 at torque when slowing down and accelerating for tolls (pan stays 215) and then goes back fast to 215-217 when resuming the drive.

While towing even on flat , as soon as i shift to S5 , temp will climb up , I found S4 to work best . On the way back to Massachusetts I got 210-212 on pan and around same on torque

 

Forgot to ask , did you get the warning light at anytime when you saw the 240 ? And was the 240 at the pan or torque ?

 

Is this what you guys are looking for?

 

This is the one we no longer have

 

240 at the pan. I havent checked TIS to confirm specifically about Tundras but on tacos/4runners and FJs the AT high temp light comes on at 300F. I have a few oil analysis reports on WS and Maxlife ATF from my 08 tundra and FJ and WS is nothing special with just average numbers. I contacted Valvoline via email about temps and they stated:

“Thank you for your question. If the temperature of the transmission fluid reaches 280*F for a long period of time, the life of the fluid would decrease quickly, within a few thousand miles. The Valvoline MaxLife Dex/Merc ATF is a full synthetic fluid that will with stand temperatures above 280*F, but the life expectancy of the fluid would decrease slower than a conventional fluid.”

So if WS is no better than Max(from multiple analysis reports from Blackstone) then 280 is where I will get worried, but I have my doubts about towing regularly and getting 100k out of this trans. And with no external atf lines, DIY flushes are a thing of the past. You will have to take it to a shop or do a pan drain and fill of 4 qts out of the 12 in the trans. Which just contaminates the fresh 4 qts.

 

And their own parts system shows it fits a 19. But just not equiped. I have mine sitting on my bench and will go on my trans after warranty, sooner if need be.

 

Pics

 

Thanks a lot for sharing.
I usually tow around 8 times during the summer , I guess I will have the dealer maintain it at 50k ( the manual states to maintain at 60k when towing) and hope for the best

 

Wonder if the dealer would be willing to install it without voiding warranty

 

I am going to do a pan drain and fill next summer. I am going to send a sample to Blackstone. That is the only way to find out if the fluid is getting too hot. I recommend the same to you. Its like $20 and then the cost of 5 qts WS. I wont use Max till after warranty as well. The color is different enough that the tech will notice if I need it replaced under warranty.

 

The one I called said no. I would ask yours. Its straight forward. The warmer is the same and the trans housing is the same. They just need to order hard and soft lines and external cooler for a 08 which will then place the cooler in front of the condensor.

 

In the questions field, put that you are concerned about high temps. They will address that in their report to you.