SR Overheats frequently

[corey240]

Moslty happens when im going up steep consistent mountains and when i drift or cruise on the interstate. Other then that its fine. Ive bled the system countless times, and made shore its allways full of fluid. Im not running a thermostat and i have flex-a-lite dual fans.


I dont know if my sensor is malfunctioning or if there seriously is a problem. I allways have this worry my motor will go if it really overheats all the time. I kinda figure its why im on my 3rd turbo, which is why im worried now. Ive had 2 t25's and now im on a t28, so i dont wana blow it...literaly.

[bluemax]

you might want to put the thermostat back in and see what happen. Faster coolant flow rate through the radiator is less efficient then a slower flowrate.

In my case, I change the both coolant sensor and now my temp is steady.

good luck

[Addicted2Kouki]

Any coolant in oil or oil in coolant?

[DDSR240]

Try distilled water and water wetter if that doesnt work try switching to 95 -98 ford taurus fans they kick ass as far ass cfam Ill search and get the exact numbers.

[DDSR240]

It flows 2500 cfam on low they didnt mention high setting but its safe to say its well over 3500 cfam, ther is also a wiring diagram on this forum in case you need it. gl

[njd07]

you say you always make sure to top up your coolant. so do you have a leak?? this is the problem if you do.

[corey240]

No theres no leak i just make shore its full to eliminate that from the list. So the taurus fans are beter then 2 flexalite fans?

[dino6192]

no thermostat = bad gas mpg.

[JdmJez]

Sounds like mine... it was the headgasket..

[SoguRacing]

maybe you need a new water pump. just throwing out a suggestion

[corey240]

My waterpump is fine. Not leaking or anything and worked fine on my last motor. Im running a Cometic headgasket on my rebuilt sr so I know its not that. Also the compression is fine. I was now told that no thermostat can make the system overheat because its flowing too much through the system, so I guess I will start using a thermo again. If that dont work I will be back.

[Cloud9]

if that works let us know for the next person who searches, and good luck.

[corey240]

What is the optimum running temperature of an sr? And what is the temp You should start to worry at?

[1slowS13]

I dont get how it sometimes work for people with no thermostat. I always figured that running without one, the coolant does not stay in the radiator long enough, thus allowing the same old hot coolant to run into the engine block again.

I believe the oem thermostat is rated at around 159 to open.

Iirc, your engine can heat up up to 220 with heavy load.

[Sileighty_85]

Originally Posted by corey240

What is the optimum running temperature of an sr? And what is the temp You should start to worry at?

OEM thermo opens @ 76.5*C so depending on outside Temperatures probably ranges around 83-97*C

probably start worrying before 105*C depending on the radiator cap you are using

mine ran around 95*C with stock radiator and thermo on a kinda hot day

Now with Nismo Thermo and Koyo Alum. Rad. and dual Electric Fans mine runs around 70-73*C on a Hot ass Day

[corey240]

Thanks I appreciate the help. I guess im getting a Nismo thermo.

[corey240]

So I put a thermostat in I had lying around and it must be bad. The car runs hot after it warms up. So does the other 2 I have, so i'l just rock no thermo till a Nismo.

[corey240]

I bought an autometer temp gauge, and when i turned the fans off the stock gauge reading was extremely hot and the autmoteter gauge said 130 f. whats gauge is right?

[SoloSilvia]

What Coolant Temp Sensor are you using? If the SR, Swap it out with a KADE and your stock gauge will read where it should!

[corey240]

actualy i was using one befor and it did the same thing, i took it back.