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Old 06-27-2021, 05:51 AM #76
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Originally Posted by 4x3Lander View Post
Not to derail this thread, but how did you get the AT Fluid Temp sensor? I have the same app for my 2002 and have never been able to find a working transmission temp sensor.




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Old 06-27-2021, 12:01 PM #77
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Thanks so much! I’ll give this a try to see if I can get it to work.
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Old 06-28-2021, 08:53 PM #78
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Had my 1998 V6, automatic in death valley, and it had a new radiator, and approx 1 years old aisin clutch fan at the time. We were fully loaded, coming from Quebec, which could compare to at least some of the weight of your armor.

Scangauge is in the truck. I did monitor, and from memory

It was very, very hot (during summer) in death valley, and the truck coolant temp would be higher than usual (usually 87-89 celcius, 188-190F), but would keep around or below 95 celcius (200F) most of the time, and I could always hear the clutch fan being on it's ''max'' setting, very loudly.

Only once it went over 212 (went to 101-103 celcius), and it was on a long, slow uphill drive, and I was not going easy on the truck at all.

Pretty normal that in higher ambient temps, you see higher coolant temps. We just don't happen to have scangauges in every of our cars, and also, the clutch fan system calls for more temp variations than a fixed speed electric fan. Happened to me, and was not really surprised. As long as I heard that clutch fan scream, I was happy and A/C was going full-blow.
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Last edited by diverscale; 06-28-2021 at 08:57 PM.
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Old 06-28-2021, 11:00 PM #79
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My two cents... There is probably nothing wrong with your 4Runner, you are meticulous with maintenance. The only thing working against you is the age of the vehicle and things like corrosion that could impact your cooling ability. I think if you weren't monitoring your temps you would have been fine to leave the AC on and keep going, but I would have done the same thing as you because that is how I am. I know mine runs 186-193 normally. 195 or 198 on really hot days and I'm working the engine in stop and go traffic or up long highway grades, but that is when temps are in the mid 90s, 100 at most. The humidity down here is killer, but that doesn't really impact the engine much.

These things are rated to tow 5,000 lbs from the factory with nothing special added. I have to imagine Toyota did some extreme weather testing towing at or near that limit. Otherwise you'd have people pulling trailers through the desert overheating. I would also assume that even with your rig loaded down and the larger tires killing the gearing, it isn't as hard on the engine as towing 5,000 lbs with a stock 3rd gen.

I do think the regear and possibly a better radiator would help keep the temps down though, which would be a good thing.
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Old 07-05-2021, 01:09 PM #80
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@mtbtim
Any luck with your truck Tim?

I’ve been thinking about yours while working on mine.

Your thermostat may be sticking or not opening fully.


I threw a 170* in mine.

And added a trans cooler + 6qt drain and fill.

I baselined the following results on a road that gains 1000’ in altitude in less than 3 miles at 7%-12% grades.

Baseline run ~25 mph +-
2nd gear mostly
All temps measured at the summit.



Here’s the same run with a new thermostat



And with the trans cooler added in line and drain and fill




The temperature relationship between the coolant and transmission fluid is interesting.

Good luck. I’m watching to see what you figure out.

Last edited by ch1966; 07-05-2021 at 01:11 PM. Reason: Wrong pic
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