rb25 overheating - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

zerocoolalmi · 08-26-2011, 09:46 PM

When I'm running my RB25 on idle or High RPM it get's hot real fast. The Upper RAD hose is HOT and
the bottom one is cold... I was not just of what could be broke beetween the Waterpump or the
Thermostat ?

So I took off the thermostat and tried running the engine again. The Temp Gauge don't climb over
the mid bar... so it's perfect ? But after a couple of metal to metal the temp gauge goes back to the
top.. because the coolant does'nt have the time cool down in the rad before going back into the engine

I tried my stock thermostat into boiling water at home... and the thermostat is working.. so I put
everything back in place... and still Temp Gauge goes back in the red"

Someone have any ideas ?

Biggamehit · 08-27-2011, 04:38 AM

whats your mixture for coolant and water?

are you bleeding the system properly?

what kind of fan are you running?

ch1873857 · 08-27-2011, 07:12 AM

stock temp gauge? did you put the KA temp sensor on the RB or are you using the RB GAUGE sensor. the small one wire temp sensor needs to be changed to the KA sensor because the skyline temp gauge is different than the KA. if you dont it will not read the correct temperature. it says you are overheated but you really could be running NOT

zerocoolalmi · 08-27-2011, 07:49 AM

ooo. may-be is the sensor.. I use a SR sensor..

and I run almost only water

and yes I bleed properly

zerocoolalmi · 08-27-2011, 07:50 AM

the probleme is not the fan.. or mixture.. because de rad be cold when I put a thermostat in the system

zerocoolalmi · 08-27-2011, 09:52 AM

someone know if the rb25 sensor is exactly the same as a sr20 ?

ch1873857 · 08-27-2011, 12:23 PM

just stick the ka one in itll take 5 minutes if you have one which im guessing you dont

zerocoolalmi · 08-27-2011, 12:45 PM

i have a sr20 sensor on the car right now.. i think is the same as a ka .. because the temp gauge inside was the same.. but i have a old rb25 sensor somewhere.. tomorow ill try it.. but i just wanna know if someone know if have a difference

haha by the way.. sorry for my english im from QuébeC

08-26-2011, 09:46 PM	#1
zerocoolalmi Join Date: Jan 2010 Location: quebec plessisville Age: 34 Posts: 44 Trader Rating: (0) Feedback Score: 0 reviews	rb25 overheating When I'm running my RB25 on idle or High RPM it get's hot real fast. The Upper RAD hose is HOT and the bottom one is cold... I was not just of what could be broke beetween the Waterpump or the Thermostat ? So I took off the thermostat and tried running the engine again. The Temp Gauge don't climb over the mid bar... so it's perfect ? But after a couple of metal to metal the temp gauge goes back to the top.. because the coolant does'nt have the time cool down in the rad before going back into the engine I tried my stock thermostat into boiling water at home... and the thermostat is working.. so I put everything back in place... and still Temp Gauge goes back in the red" Someone have any ideas ?

08-27-2011, 04:38 AM	#2
Biggamehit Zilvia Addict Join Date: Jan 2005 Location: Misawa Japan Age: 42 Posts: 713 Trader Rating: (11) Feedback Score: 11 reviews	whats your mixture for coolant and water? are you bleeding the system properly? what kind of fan are you running? __________________ Facebook: Pink Ranger Drift

08-27-2011, 07:12 AM	#3
ch1873857 Nissanaholic! Join Date: Sep 2003 Location: Andrews Air Force Base Posts: 1,906 Trader Rating: (1) Feedback Score: 1 reviews	stock temp gauge? did you put the KA temp sensor on the RB or are you using the RB GAUGE sensor. the small one wire temp sensor needs to be changed to the KA sensor because the skyline temp gauge is different than the KA. if you dont it will not read the correct temperature. it says you are overheated but you really could be running NOT

08-27-2011, 07:49 AM	#4
zerocoolalmi Join Date: Jan 2010 Location: quebec plessisville Age: 34 Posts: 44 Trader Rating: (0) Feedback Score: 0 reviews	ooo. may-be is the sensor.. I use a SR sensor.. and I run almost only water and yes I bleed properly

08-27-2011, 07:50 AM	#5
zerocoolalmi Join Date: Jan 2010 Location: quebec plessisville Age: 34 Posts: 44 Trader Rating: (0) Feedback Score: 0 reviews	the probleme is not the fan.. or mixture.. because de rad be cold when I put a thermostat in the system

08-27-2011, 09:52 AM	#6
zerocoolalmi Join Date: Jan 2010 Location: quebec plessisville Age: 34 Posts: 44 Trader Rating: (0) Feedback Score: 0 reviews	someone know if the rb25 sensor is exactly the same as a sr20 ?

08-27-2011, 12:23 PM	#7
ch1873857 Nissanaholic! Join Date: Sep 2003 Location: Andrews Air Force Base Posts: 1,906 Trader Rating: (1) Feedback Score: 1 reviews	just stick the ka one in itll take 5 minutes if you have one which im guessing you dont

08-27-2011, 12:45 PM	#8
zerocoolalmi Join Date: Jan 2010 Location: quebec plessisville Age: 34 Posts: 44 Trader Rating: (0) Feedback Score: 0 reviews	i have a sr20 sensor on the car right now.. i think is the same as a ka .. because the temp gauge inside was the same.. but i have a old rb25 sensor somewhere.. tomorow ill try it.. but i just wanna know if someone know if have a difference haha by the way.. sorry for my english im from QuébeC