Over heating

Reyn S · Post by **Reyn S** » Sat Aug 22, 2009 10:16 am

I’m running a RB25DET motor in a S13. The car over heats, but only when I drive 200+km and keeping it there for a while. I have taken out my thermostat but then it gets hotter faster so I replaced it. I’m running my CA18 water temp sensor, a 3 core alloy radiator and a bottle system so it has no airlock I am also running 2 12” fans in the front. I have tested it with out my bumper for more air but it still over heats.
Any body

Drillergy · Post by **Drillergy** » Sat Aug 22, 2009 11:06 am

My 2c... Check you radiator cap is holding pressure, FMIC is too close to your rad, 12 inch fans not powerful enough, head bolts not evenly torqued or your hg is going. Im not the expert though.

rat · Post by **rat** » Sat Aug 22, 2009 9:42 pm

make sure your fan are flush against the radiator

Reyn S · Post by **Reyn S** » Sun Aug 23, 2009 12:09 am

Drillergy wrote:My 2c... Check you radiator cap is holding pressure, FMIC is too close to your rad, 12 inch fans not powerful enough, head bolts not evenly torqued or your hg is going. Im not the expert though.

all is cool. The fans dont work on 200+km anly air caming from the front.
Thanx

Reyn S · Post by **Reyn S** » Sun Aug 23, 2009 12:13 am

rat wrote:make sure your fan are flush against the radiator

The fans are flush. I run one 14" before and still the same, but on hi speeds the fans dont work. air caming in the front cools down the radiator.

rat · Post by **rat** » Sun Aug 23, 2009 12:14 am

Reyn S wrote:
Drillergy wrote:My 2c... Check you radiator cap is holding pressure, FMIC is too close to your rad, 12 inch fans not powerful enough, head bolts not evenly torqued or your hg is going. Im not the expert though.
all is cool. The fans dont work on 200+km anly air caming from the front.
Thanx

maybe your radiator is not hardcore enough, sorry dont have any useful help

Reyn S · Post by **Reyn S** » Sun Aug 23, 2009 12:16 am

rat wrote:
Reyn S wrote:
Drillergy wrote:My 2c... Check you radiator cap is holding pressure, FMIC is too close to your rad, 12 inch fans not powerful enough, head bolts not evenly torqued or your hg is going. Im not the expert though.
all is cool. The fans dont work on 200+km anly air caming from the front.
Thanx
maybe your radiator is not hardcore enough, sorry dont have any useful
help

im running a 3 core BMW radiator with alloy tanks.

aep886 · Post by **aep886** » Sun Aug 23, 2009 12:47 am

it very common when puting different engine into S13! the thermostat tend to read different temp for CA18 and RB25~!
replace the thermostat and the sensor will do

300sx · Post by **300sx** » Sun Aug 23, 2009 9:50 am

dunno hey.. can think of a few small things,

check that the waterpump is actually pumping at full capacity, these pumps sometimes fail in such a way that the impeller sits loose on the shaft, thus not rotating same speed as the shaft..

make sure you are circulating the right way through the rad? water should enter top of rad and exit bottom back to motor.. only mentioning this because you using a differant rad..

if you are using a second hand rad, was it properly flushed? might be partly blocked?

an overheating problem in a car that has a non standard cooling system such as yours is hard to diagnose..

Reyn S · Post by **Reyn S** » Mon Aug 24, 2009 7:23 am

aep886 wrote:it very common when puting different engine into S13! the thermostat tend to read different temp for CA18 and RB25~!
replace the thermostat and the sensor will do

Im running tha standerd RB25DET thermostat with the CA18DET temp sensor because im still running the standerd cluster.

rat · Post by **rat** » Mon Aug 24, 2009 7:43 am

Reyn S wrote:
aep886 wrote:it very common when puting different engine into S13! the thermostat tend to read different temp for CA18 and RB25~!
replace the thermostat and the sensor will do
Im running tha standerd RB25DET thermostat with the CA18DET temp sensor because im still running the standerd cluster.

off topic but have you got everything working in the std cluster?

Reyn S · Post by **Reyn S** » Mon Aug 24, 2009 7:51 am

300sx wrote:dunno hey.. can think of a few small things,

check that the waterpump is actually pumping at full capacity, these pumps sometimes fail in such a way that the impeller sits loose on the shaft, thus not rotating same speed as the shaft..

make sure you are circulating the right way through the rad? water should enter top of rad and exit bottom back to motor.. only mentioning this because you using a differant rad..

if you are using a second hand rad, was it properly flushed? might be partly blocked?

an overheating problem in a car that has a non standard cooling system such as yours is hard to diagnose..

The pump pumps at full I have checked but thanx.
I hade the “Radiator specialists” cum check the setup before they made my radiator. Thanx I will check.

angelo · Post by **angelo** » Mon Aug 24, 2009 8:22 am

hi had the same problem with my car and girlfriends car.

Car overheating at high speeds (not in traffic)

In both cases we had to get the radiater sonic cleaned. A normal radiator cleaner/flush wont cut it. The one radiatoer was new/reconned and we still had to send it back to get cleaned.

Reyn S · Post by **Reyn S** » Mon Aug 24, 2009 3:53 pm

angelo wrote:hi had the same problem with my car and girlfriends car.

Car overheating at high speeds (not in traffic)

In both cases we had to get the radiater sonic cleaned. A normal radiator cleaner/flush wont cut it. The one radiatoer was new/reconned and we still had to send it back to get cleaned.

My radiator is brand new

Reyn S · Post by **Reyn S** » Mon Aug 24, 2009 3:57 pm

rat wrote:
Reyn S wrote:
aep886 wrote:it very common when puting different engine into S13! the thermostat tend to read different temp for CA18 and RB25~!
replace the thermostat and the sensor will do
Im running tha standerd RB25DET thermostat with the CA18DET temp sensor because im still running the standerd cluster.
off topic but have you got everything working in the std cluster?

Yes everything works but my rev counter is out with 1500rpm's