Transmission cooler or not Thread

Does anyone know how to show T/C lock? Is that a user defined pod also?

 

See post #249-250

 

i did not require any custom pid's.

i bought the app for $10 and the '19 toyota adder for $10.

i use "status of the lock up" for t/c lock. it's in the engine and electronic controlled transmission menu.

i also use "a/t oil temperature 1" for the pan temp, and "a/t oil temperature 2" for the t/c temp.

all three i've mentioned above are in the $10 adder package.

cannot wait until i receive / install my cooler.

i saw pan temps at 221 and t/c temps hit 243 today.

no load, no towing, no passengers. it was just me in the pickup and while i am not "trim" by any means, i weigh in at 205 lbs.

outside temps were anywhere between 77-80.

 

Thanks, that’s exactly what I needed. I also followed post #249 & #250 and got the lock displayed figured out. Now I just need to dig up $800+ for the cooler kit. I tow a 7 x 14 utility trailer, maybe 4K lbs tops on a daily basis. I will post temps once I get some data. I’m in Delaware, which is flat as a pancake. So it will only be weight effecting it, not incline.

 

Try to test with s5 and then s4 and see if it makes a difference

 

Sorry if this has been addressed before and I did read many of the 1,000,000 posts about this BUT they all center on the health of the ATF and no discussion of the transmissions parts to withstand extended higher heat.

While the Tundra transmission is legendary I'm sure some break down and wonder if there is an "Achilles Heel" and if this is a part that could demonstrably be effected adversely by high heat?

I've wrenched on trucks all my life but transmissions left to the pros! Gosh...come to think of it, out of maybe 20 vehicles over 40 years I've never experienced a transmission failure.....So I'm in the dark.

Thanks!

Trav

 

I think most of the components in the transmission can take as much if not more heat than the ATF. Correct me if I’m wrong I think the issue is if the ATF has excessive thermal degradation then the viscosity and lubricity go to shit and then that’s when you get excessive wear on the internal components. I’m not an auto mechanic but work in industrial operations and maintenance and that’s usually the issue when an oil or fluid overheats excessively. It stops lubricating and then shit gets tore up.

 

I'm not a tranny guy but am familiar with materials used in industrial high heat situations. 300-400 deg is really not that hot for most solid materials, including modern gaskets. I would expect that the materials used in the tranny are all rated for much higher temps than the ATF can take.

 

So what should be done about having our window sticker reflect that the cooler is on my truck with the towing package? I plan on towing trailers for camping in the Texas hill country and possibly Colorado. I have owned several trucks and towed all sorts of loads and have never burned up any transmissions. How worried should we be about this? We purchased this truck for the reliability. I never thought I would have to install mods to prevent damage to a brand new truck.

 

I've read every post in each of the threads on this topic. Based on the assumption (fact?) that the 4.7L million mile Tundras did not have anything more than the puck, yet survived that much abuse gives me added confidence in my truck, including the transmission. That said, if I do anything that might push the temps higher than about 230, I will have mine serviced with the fluid replaced earlier than the recommended maintenance schedule. My decision is not completely dependent on those two vehicles, but they were the icing on top. Do I think it would hurt to add an $800 cooler? No. And if I really pushed my truck on a regular basis I would think of it as a wise insurance policy.

 

exactly , I will be doing same thing, service it every 30k , I tow around 8 times a year my 4000lb travel trailer and honestly my temp stays at 215 on average

 

And if your truck would have come with all of the sticker specified tow package components that you paid for you wouldn't even have to do that...or install a scan gauge or worry about temperatures and the list goes on and on

 

I think both million mile tundras were actually 4.7L motors and not the 4.6L. The 4.7L motors had transmission coolers to my knowledge.

 

Yes, it looks like both were the 4.7L 2UZ-FE, which had a cooler with the tow package. I’m not sure if they both had tow packages or if it came without one.

http://www.trucktrend.com/how-to/project-trucks/1705-million-mile-tundra-the-tear-down/


https://www.motor1.com/news/347462/second-toyota-tundra-1-million-miles/amp/

https://www.sparksparts.com/oem-par...0dW5kcmEmeT0yMDA3JnQ9c3I1JmU9NC03bC12OC1nYXM=

 

According to Toyota, you do have a cooler. They never claimed it was effective.

https://toyotaparts.mcgeorgetoyota.com/oem-parts/toyota-trans-cooler-3349034010

 

Apparently there is a 5.7 that hit 1 mil too. Unsure if he has tow package and trans cooler.

https://www.tundratalk.net/threads/another-1-million-mile-tundra.770336/#post-9487452

 

Corrected in original post. . .

 

I drive about 12,000 miles per year....my truck will be 83 years old by time it reaches one million miles.

 

I work in a petrochemical plant. There is not one single compressor, gearbox, motor, transmission (except Tundra lol), pump, turbine, or any rotating piece of equipment to have a temperature alarm above 180F. Plant equipment is designed for 20 year lifespan 24 hours a day 7 days a week. If we drove our trucks around the clock for 24 hours at 50 mph in 3 months you would have 120K miles, lol. 6 months 250K miles. Our trucks aren't run very often so maybe 250F on transmission fluid is ok, not like they run even a year around the clock.

 

2018 and up F150 liquid to liquid cooler , no longer has the auxiliary trans cooler in radiator. They are reporting close readings to the 19 onward tundras

 

You have a cooler. Law of thermodynamics. Coolant removes heat from ATF via the puck.

 

Can someone explain how the puck can be considered a cooler. Full disclosure, I’m not a molecular engineer. However, if I’m correct, the puck first warms the ATF with motor oil. That motor oil is 160-180 and above. How can that cool better than the ATF passing through an external cooler with 80, 90 even 100 air flowing through at 70 MPH?

 

I guess you didn't read the whole thread. No one said it's better. No one said it's effective at all. But if the ATF is warmer than the coolant, then the puck will cool the ATF some infinitesimal amount.

 

I have read the thread. I did see what you’re saying mentioned. However, I’ve also seen many stating we do have a cooler “the puck”. All I’m saying is the puck can’t compete with an air flow cooler. What really irritates me is I came out of an F-150 with a 10 sleep. I don’t even want to get into that. I’ve avoided the Tundra for fuelaholic reason. Don’t get me wrong, I do not regret my decision at all. I’m just confused how Toyota can make this change so close to a redesign, after having the cooler for so many years.

 

I think the puck uses engine coolant, so once your trans temp is above 200F then engine coolant is 195F, it cools. Kind of like emptying a swimming pool with a tablespoon sure it can be done may take 100 years. It just to small to be effective as a cooler or heater in my opinion. So when your trans is at 250 and engine coolant at 195F it will cool.

 

At least your irritation isnt due to lack of rest.

 

I see what you did there. Can I blame autocorrect? I did lose rest over that 10 speed. I will sleep like a baby....once my ATF cooler is installed. I’m only at 5k miles and haven’t towed anything substantial yet, but I will next year. I do not want to think about temps while towing a trailer 3-5 hours.

 

When ATF is cooler than coolant, puck is a warmer for the ATF circuit.

When the ATF is warmer than the coolant, puck is a cooler.

No one here or the 500 other threads has stated anything regarding the pucks efficiency in removing heat, but Toyota did not lie when they stated that there is a cooler. Based off the puck, there is a cooler.

 

There's a lot more to this than cooler things cool and hotter things heat. Heat is always flowing between materials based on heat capacity.

Couldn't the ATF be considered a water warmer since it's hotter than the water? As I understand it's a heat exchanger not a cooler or warmer. My chemistry/physics is weak and I know heat capacity of different fluids varies but if I take 250° oil and put it next to 200° water the net result will be somewhere in between. This would rely upon flow of each as well. Adding hot ATF at twice the rate as water will result in hotter....PLUS the ATF is still next to HOT ATF and a LARGE heat sink of a transmission block !

I read where the volume of ATF in the puck at any one moment ~8 oz. which is roughly 1% of the total volume of ATF..... Perhaps the same volume of water is involved. So we have 15 quarts of hot ATF in a several 100 lb metal transmission and a few ounces of water are going to cool it off.... OK...

At any rate I'm convinced the puck doesn't cool very much at all. I can see how it could be a simple way to warm the ATF which as I understand was the original purpose and name but even a few years removed from chemistry and physics courses I can't see how the puck cools in any appreciable fashion based on the above.

I'm saving for an ATF cooler next spring/summer.

 

My comments above in bold