Radiator Cool down period

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Question, I have a 00’ 3rd gen with 194,xxx miles. Just replaced the radiator 200 miles ago. Backstory is I was driving uphill without OD off and before I knew it my ATF temp was 270’ and my coolant temp was 220’ that leaded to white smoke under the hood and leaking coolant everywhere. (I obviously take blame I’m new to the 4Runner scene and didn’t to my research on how to manage temps) my buddy and mechanic did a bunch of HG testing and luckily it all passed and I didn’t blow a head. Radiator was replaced. I plan on adding a external atf cooler after Tim (thanks for your videos) convinced me. My question is this: I went on a drive this morning 7am and the ambient temp was 50’ almost 2 hours later I went down to my truck and popped the hood to check my fluid levels on the radiator and it was very hot the the touch still. Is this normal? Current ambient temp is 58’ now. Also, I’m trying to determine if I need to get a new thermostat. When driving on flat ground my rad coolant temp sits between 194 and 199.4. Sometimes while sitting it hits 200’. I know I need to jiggle valve my thermo to 6’ but are these coolant temps for the radiator normal?

Thanks!


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Those temps are not too concerning. I ran 205 - 207 while cruising before I changed the T-stat jiggle valve to 6 o'clock (even with fresh coolant). I now run about 190-194. Can't hurt to change it though.
 
TheGrasshopper said:
Those temps are not too concerning. I ran 205 - 207 while cruising before I changed the T-stat jiggle valve to 6 o'clock (even with fresh coolant). I now run about 190-194. Can't hurt to change it though.
Click to expand...



Does your runner smell hot constantly? I have a mild oil lead that I know could cause the smell but damn the thing smells hot CONSTANTLY. I can smell it when I’m stopped and pull forward


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They will hold heat for along time, especially with the hood closed.
Nothing to worry about.
Also, anything over 120 feels very hot to us.
 
before the overheat, did you purge the cooling system of air?

when you drain the cooling system, like when you replaced the radiator, air gets in the system and when it's not removed, it can cause overheating.

immediately after replacing the coolant, you need jack up the front or park in a sloping area with the front up. start the engine and open the radiator cap and let the coolant cycle a. few times until no more air bubbles come up and add a little more coolant to replace the air pockets.
 
220 with steam probably means you've got either way too much water in the system and not enough coolant or you are not holding pressure. Did the mechanic perform a pressure test on the system? That will tell you where the steam came from.

270 trans temps though is ridiculously hot!! Check your fluid ASAP and it it smells burnt change it before damage is done to the transmission. Your temps should never get that high.
 
220 shouldn't blow a radiator or hose. It is too hot, for sure, but the system should still hold pressure and it won't damage the engine immediately. I think your radiator was on its way out whether you got to 220*F or not.

As Tim said, do a transmission fluid change or two (drain and refill) to take care of the trans. Make sure the jiggle valve is at 6 o'clock, and you should be running around 190*F engine temp or so under almost all conditions.

It'll all be fine...

-Charlie
 
HiluxSurf SSR-G said:
before the overheat, did you purge the cooling system of air?



when you drain the cooling system, like when you replaced the radiator, air gets in the system and when it's not removed, it can cause overheating.



immediately after replacing the coolant, you need jack up the front or park in a sloping area with the front up. start the engine and open the radiator cap and let the coolant cycle a. few times until no more air bubbles come up and add a little more coolant to replace the air pockets.
Click to expand...



My buddy did all that, he did pressure test it and it all passed! He said I got lucky.


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gamefreakgc said:
220 with steam probably means you've got either way too much water in the system and not enough coolant or you are not holding pressure. Did the mechanic perform a pressure test on the system? That will tell you where the steam came from.

270 trans temps though is ridiculously hot!! Check your fluid ASAP and it it smells burnt change it before damage is done to the transmission. Your temps should never get that high.
Click to expand...



It was pressure tested yes, everything passed. Which is good he said I got lucky.


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How old is the timing belt/water pump ?
Do the transmission flush in Timmy's video so you replace all the fluid in addition to pulling the pan and adding an inline Magnafine filter.
 
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