t-stat question

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jkl72-40

jkl72-40

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Jan 28, 2006
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Location
Scottsdale Arizona
82 22r
it gets hotter than I like it to but not over heating (in AZ @ 75 degrees @ 65mph) (so at 110 :eek: degrees @ 65 mph its over heat time) the questions are:
Will the motor run hotter with a lower temp (165) t-stat at 65mph and cool down quickly at idle? if so that is my problem if not what is?
What is the stock t-stat temp?:meh:
thanks:steer:
k
 
Does it have a 3 core in it? If not, I'd get one from a 3 core RE, RTE or V6.


I'd start with the basics: When's the last time it was flushed, what's the coolant look like, and when't the last time the T-stat was changed?


Should be easy to find out the stock temp with a Napa parts search, or a look in the FSM.


And no, a colder T-stat wouldn't make the motor run hotter...


Though I have heard a guy say his truck overheated going down the road with NO T-stat in it. He said it was b/c the coolant wasn't in the rad long enough to get cooled.

There is no resistance with no T-stat so there is SOME merit it could run hotter.

Bottom line, get more cores. But I'd start with a new T-stat.
 
Last edited:
If you take the T-stat out of a properly running cooling system, the truck will never warm up. If you run without a T-stat and your truck still overheats, then your radiator is shot. (Let me guess.... he took the T-stat out because his truck was overheating...)
 
stock rad, just changed the coolant 170k miles
i do know the fj40 will overheat w/o a t-stat
i can try it w/o the t-stat
and get a new t-stat
ok will see what happens
thanks
 
good info
Hilux said:
Does it have a 3 core in it? If not, I'd get one from a 3 core RE, RTE or V6.


I'd start with the basics: When's the last time it was flushed, what's the coolant look like, and when't the last time the T-stat was changed?


Should be easy to find out the stock temp with a Napa parts search, or a look in the FSM.


And no, a colder T-stat wouldn't make the motor run hotter...


Though I have heard a guy say his truck overheated going down the road with NO T-stat in it. He said it was b/c the coolant wasn't in the rad long enough to get cooled.

There is no resistance with no T-stat so there is SOME merit it could run hotter.

Bottom line, get more cores. But I'd start with a new T-stat.
Click to expand...
 
its raining so cant really check the t-stat and rad right now

I'd get one from a 3 core RE, RTE or V6.

do they bolt right in?? got more info on them? I have a/c so not alot of room there how would it fit?
 
I just finished adding a radiator from a 93 runner V6... FIt just fine exept for the fan shroud you will have to add a plate/bracket. Also, it looks a bit bigger than the 86 22re turbo radiator.

You might need longer hoses.
 
did u put that 86 runner in your 87? sounds good but it may not fit in an 82 22r got pictures? any more info on this?
k
 
ok put new stock t-stat in (180) now it still gets hot on the hwy @60 but can go stop sign to stop sign no problem I did not have this problem before I did the timing chain could the timing be off to make it run hot?
 
jkl72-40 said:
ok put new stock t-stat in (180) now it still gets hot on the hwy @60 but can go stop sign to stop sign no problem I did not have this problem before I did the timing chain could the timing be off to make it run hot?
Click to expand...

Yes. Timing too advanced will make it run hot.


Hilux said:
will super advanced timing cause a motor to overheat?
Click to expand...

WristPin said:
yeah, thats probably one of the reasons it overheating, if not the only reason.
Click to expand...
 
I agree, look into a radiator, and a flush.
When's the last time the motor was tuned? Could it be running lean?
clutched cooling fan? I'd also look for excessive play in the clutch.

Hoping for the best!
 
The silicon oil in the clutched cooling fan can break down. You can change it if you want. Somewhere on this site is a description on how to.
 
A failed fan clutch will have the opposite condition: overheat in traffic, stop & go, but run fine on the highway.

I would suspect the radiator. What did the water pump look like when you were doing the timing chain?
 
KLF said:
A failed fan clutch will have the opposite condition: overheat in traffic, stop & go, but run fine on the highway.
...
Click to expand...

Not always, it depends on weather conditions, motor load, airflow restriction of the coolers, etc. I have seen lots of poor preforming fan clutches cause highway speed overheating.
 
jkl72-40 said:
... could the timing be off to make it run hot?
Click to expand...

Yes, if the ignition is advanced too far it can cause loaded heating. If your fan clutch is weak, I have fluid that you are welcome to use.
 
Tools R Us said:
If your fan clutch is weak, I have fluid that you are welcome to use.
Click to expand...
You can also get the silicon oil at many hobby shops that handle off road RC cars. It is used in the shocks for the off road RC cars.

The real pain of changing the oil is getting the stuff out. I lined a pan with AL foil and baked it in the oven for an hour at 200F. To keep the misses from killing you, I'd just use a cheap disposable AL pan. Main thing is it must not leak.

Another thing is that o-ring seal around the edge is unobtanium. Save it so it can be reused.
 
fan seems to be ok I am leaning toward timing and for sure radiator it sat for a yr empty
the wp was fine
thanks
 
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