Avoid Overheating Turn Off AC Next XX Miles

Show me your data proving your point that it does nothing and I’ll show you mine. Start with this - coolant temp controls the low/base temp of the transmission fluid, ignore the cooler, thermostat is shut as it should be to keep it there. Guess what the low/base temp is with it pinned? Makes a big difference. Operating with a lower base temp with less heat sink the transmission runs cooler till it doesn’t, takes longer till it doesn’t. That pesky time at temp thing. You really think Toyota would recommend the average Joe climbing under his truck to pin it open if they lived where it’s hot as hell? Random Toyota engineer talking to a friend - “You could add a supplemental cooler, or just pin it open during the summer”.

 

That last bit kind of confused me. The thermostat I'm talking about is for the supplemental cooler, so that random engineer convo doesn't quite make sense. There is no way to pin it open without having the cooler. One requires the other.

As for the data, you are claiming that pinning the thermostat is advantageous. This would imply that the engineers who designed it with the thermostat did so in error. To back that implication there needs to be some kind of data. My data is purely that the engineers designed the transmission cooler system with the thermostat. If the consensus that the cooler was altogether dropped to save money, why would they not have saved the initial money by not designing and including a thermostat in the first place?

Pop over to the Genuine Cooler thread, and it's discussed at length. As you said, pinning the trans cooler thermostat open just causes the fluid to take longer to get up to operating temp. In a hot area, not a big deal, and if you never leave your hot area you're fine. You're not any better off than if you didn't pin it. Once it's up to temp, which will take less time in a hot climate, the thermostat would be open anyway and behave the same way as if it were pinned. There is no real advantage here. However, if you do leave the hot climate, visiting family, vacation, whatever, then if you do not unpin it you can wind up taking way longer than designed to heat the fluid to operating temp. This will impact MPGs for one, and possibly other aspects of operation.



This is the fun thinking part, and just how my brain is looking at it in the moment, so correct me if I'm wrong. The thermostat blocks the transmission fluid from flowing from the front air cooler back into the transmission. That cooler is full of fluid this whole time, and it would be cooled from the initial base temp. So as the transmission heats and triggers the opening of the thermostat, that precooled fluid is then introduced and lowers the overall temp. Now, I do not know if this cooling would be enough to lower the overall fluid temp enough to close the thermostat again, which if not would be a free flow system like pinning it from then on. If it would be able to reach a cooler temp than if the fluid were just continually cycled through the air cooler if may run cooler overall. Worst case scenario, once open it would remain open and behave as though it were pinned. Best case, maybe it could actually run a little cooler because the act of sectioning off a portion of fluid so it can be cooled below what a free flow system can achieve and then reintroducing it may be a more efficient cooling process. Thoughts?

 

Those of you that added just one cooler are suckers.

You need 6 total: three with thermostats and three without.

I'm in final beta testing of my new tranny cooler. It mounts to your roof via a mast. The coolers (6 of 'em) are arranged on top of the mast radially... looks like a 6 cylinder radial engine. The mast attachment point to the roof is drill-less, the correct size drill bit is included with the kit.

When testing is complete you'll be able to order them at JennuwineKewlerzEnnat.org

 

Anxiously awaiting !

 

Wait, since when does the K1600GTL ZX-14R even have a transmission? Your claimed use of 6 radially mounted coolers seems like flimflam, and you’re just trying to fit in with the cooler crowd. No pun intended.

 

He has the prototype, the transmission was never installed on the production model.

 

Coolers mounted on the roof mast have to be painted white not to absorb heat from sunlight.

 

Here is a pic regarding the last thought. You’re pretty right about how it works, looks like it blocks flow “to” the cooler when closed.



A pinned thermostat will take longer for the ATF to get to operating temp, but I could see where it would be beneficial. Maybe in a really hot area where you know you are pushing your truck, pinning it would lower the floor of the thermostat. Most say it opens around 185, which also means it closes back around 185. Pinning it would mean there was no 185 floor and have the potential to cool longer.

But at the same time, if it closes at 185 then it’ll just reopen once it goes back past 185.

 

Agreed. Besides, if you're towing, you'll be higher than that anyways.

Pinning thermostat is like sticking 5.7L sticker on a 4.6 and proclaiming it's faster.

 

I thought it has been proven that more stickers = more horsepower.

 

TLDR all of that. Same thermostat. Adding a supplemental cooler to the pre-19 trucks with a cooler is a thing here also.

 

Really? Two coolers? That's wild. Lived in AZ for a bit, so I guess I shouldn't be surprised, but I wouldn't think of it out of the blue.

 

You wish.

The entire system will be triple plated chrome.

 

I have those signs in cali going up the mountains and i just monitor my coolant temperatures. If they reach over 210°F sustained, ill usually back off on the AC, but it doesnt even get close to that in my '21. My old 02 ranger I would turn it off but it was over 250k miles and I didnt want to take chances.

 

Wow, I guess I created a partial shit storm. I am not even going to ask on here if an airplane would take off if it was on a giant treadmill.

 

I think you should!

 

Nope. It requires movement of air over/under the wing, or rather the wing moves through the air. Because it remains stationary there would be no lift generated.

 

My thoughts exactly.

 

Yes. More common on 4Runner’s. This is the cooler that was recommended to install by a local Toyota shop. But I had a monkey problem, not banana - hot+elevation+should of been using 4LO.
https://automatictransmission.com.a...-kit-to-suit-toyota-tundra-with-6-speed-auto/

 

I think myth busters said it would? LOL

 

If you have a fan running and blowing at it on very fast setting, plane would take off.

 

Plane on a treadmill would be pointless cause the wheels don’t turn to accelerate the plane, it’s the engines that make it accelerate which make no contact with the treadmill. The engines push the air, so the plane would just roll off the treadmill.

 

so that's how airplanes accelerate!!

 

Ever turned your heat on full blast during a hot summer day? Pretty remarkable to watch the temp drop. One of the first things I learned in drivers Ed.

 

I turn mine off in long grades just out of habit. Not needed at all as the temps are all within range.

 

https://www.youtube.com/watch?v=YORCk1BN7QY

 

Rebuttal. Mythbusters wasn't exact enough.

https://youtu.be/Y64ZdSaDdoo

 

I learned this as a young guy driving junk. Works great untill heater core leaks.

I have a tundra now. All systems go, at all times.

I love my tundra.

 

The mythbusters was a joke, they were basically just towing the treadmill / tarp.