Water Temp 200 degrees F??

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tercelica

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Another question about my supra. I can drive my car in all but slowly the water temp rises to 200+ degrees F... It will go to 180 for maybe 5 minutes, then slowly go to 190 after like a minute, then after that it goes 200 after a minute.. sorta like that. I checked the water pump and its fine... I pulled out the thermostat and there wasn't one... but I asked at my work and my co worker said that considering our weather is mainly HOT, for some cars its ok to run w/ out a thermostat. I was also told to check my timing so I did my timing over... still does it but gets hot slower than what it was going at before. Could it also be my fans??? because I have HONDA electric fans. when i did the swap i also took off the fan clutch and i'm using honda fans now. could it be that its not getting the radiator cool enough? Help would be appreciated. Thanks in advance :)
 
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tercelica

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OK :) i got a thermostat today. I'll put it in tomorow morning. and i'll see what happens from there. 180 degree thermostat? that should be acceptable right?
 
jdub

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Well...that depends ;)

The stock system was designed to run with a 195 deg F thermostat...running it at a lower temp may cause an idle problem due to the temp (176 deg F) the ECU switches from cold to hot idle. The ECU adjusts the ISC valve based on engine temp and stops that adjustment at cooler temps to keep idle high. It switches over to warm idle at ~176 deg F and uses a different algorithm to adjust the ISC valve to target idle (650 rpm)

It also depends on how much tolerance the A/F ratio system (input from the O2 sensor) allows...this ECU system will attempt to compensate for the lower coolant temp and could cause you to run rich across the board.

Will you experience these issues? That is going to depend on the capacity of your cooling system. Running a stock radiator make it more likely, but since you say that you're in a warm climate...you may not have any issues at all.

You can install the 180 deg F thermostat, but it will not make your coolant temps lower...it will just open up earlier to allow coolant into the radiator. If you can accurately read your coolant temps (reading you 1st post says you can), if it is still running at 195+ deg F with the 180 deg thermostat...you should have no problem.
 
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tercelica

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The fans are from maybe a 80ish accord. one is about the same height of the supras radiator, and the second fan is maybe 3-4 inches shorter than the supras radiator. Ummm... i just realized that my O2 sensor was cut on one of the wires. Tomorow i'll fix it... this could be another problem ehh...??
 
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tercelica

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Ok i'll check the codes also... but i didn't check them yet because my check engine light never came on.... OK if it stays at 200 after i put in the thermostat, and fix the o2... then i'm just going to leave it then :).
 
mrnickleye

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:biglaugh: For many years I've run a 180* stat in summer with NO problems, and a 195* stat in winter to get better heater ops.

Fans are only there for/working below 30mph and idle.

When engine is fully warmed up (after 20 minutes), 200* is considered a normal temp.

Be sure NOT to run higher than a 50/50 mix of antifreeze, as water absorbs heat better than coolant. but coolant keeps the boiling point higher, and keeps the system from developing corrsion (which causes overheating too).

A new cap costs $6.

"Water Wetter" works !:love:
 
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tercelica

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It gets past 210 now... but it takes maybe 15 minutes... stays on 200-205 for a long time... then it goes UP... and doesn't stop... slowly goes up tho, not super fast. I have the prestone antifreeze that mixes with whatever kind... it's not a 50/50... Could that be a reason why?... also could it be my fans... i might boy some fans at my work that are like I THINK 6000 RPM's?? good enough no?? kuz i don't know the honda RPM's on my fans...
 
Nick M

Nick M

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A new stock fan clutch works better than fans. A worn fan clutch that spins freely does not move much air.

I don't know what all you have or don't have, but everything was put on the car by Toyota for a reason.

Make sure you have the undercover, working fan clutch, thermostat, 50/50, fan shroud is very important, and the electric fans work as designed.

Overheating can be symptom of an engine problem also.
 
3p141592654

3p141592654

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Oct 11, 2005
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It should not run 200C without a thermostat. It should be running very cold instead. You have a cooling problem. I would start by examining the radiator for clogs.

It is also well know that proper air flow is critical. The shroud for the stock fan is critical to get uniform airflow thourgh the entire radiator area. WIthout it, air just flows in the vicinity of the fan blades.

Since you probably ditched the shroud to fit your electric fans, you may have reduced both the total airflow and its uniformity and hence cooling capacity.
 
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tercelica

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OK.. i changed out the fan clutch... and drove it around... and it gets hotter faster than it did w/ the electric fans... i just turned it off and its at 235degrees... oops just thot of the fan shroud.... wasn't there a small electric fan also??? I'mma go check before work :) thanks again!
 
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malloynx

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200 IS NORMAL. lower temps can accerlate engine wear, poor fuel economy, etc. the hotter the better,(UP TO A POINT)
 
Nick M

Nick M

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If you have cooling problem with a new fan clutch, not a worn one, you could have a radiator that is ineffective also.

Does it cool down with highway speed?
 
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