OVERHEATING!!! Help

[MR-VTEC]

hey guys,

i got a H22a in my civic and was using a prelude radiator but i changed it over to a KOYO aluminium radiator and ever since then i have had problems.

My car is running exactly 10 degrees hotter no matter whether on the highway or in traffic, it runs at 98 degrees . Also once the car has heated up it is pushing coolant into the overflow.

i have installed a switch so i can control my radiator fan in cabin or so i can run it constantly once the car has warmed up( i run the fan constantly once the car is warmed). i have also purchased a cusco 1.3bar radiator cap. i have flushed and bled the system.

i just cant seems to get the temperature any lower. i want to get the temp back to around the 85-88 degree mark where it used to be.

obviously it has something to do with the radiator as i had no problems before i changed them.

anyone got any ideas or suggestions.

[SKREMN]

why did you change radiators?
is the new radiator the same capacity as the old one?
maybe the radiator is shit and hasnt got good flow?

[egSi]

im guess ur thermostat is all good? i just swapped in a thicker alloy radiator + flushed system and all is good.

ur radiator come with any warnings etc? mine said no mixing coolant and no akaline coolants etc.

btw my eg>yours

[Weq]

im guessing u whiched from a full size to a half size radiator? i have heard some theorys around that having a half size without anything next to it will cause air to flow around it instead of into the fins.... but thats just a thoery..

my guess is there are some bubbles in the system.. what kind iof overflow is it - is it hot as hell? does the collant look fresh in the overflow bottle, or off coloured.

[MR-VTEC]

why did you change radiators?
is the new radiator the same capacity as the old one?
maybe the radiator is shit and hasnt got good flow?.

I changed radiators because im am currently turboing the car and the compressor side of the turbo didn't fit with the old radiator so i had to go back to a civic half size raidator. This is why i got a Koyo radiator as it is a lot larger in capacity than the civic one but is still only a half size one.

im guess ur thermostat is all good? i just swapped in a thicker alloy radiator + flushed system and all is good.

ur radiator come with any warnings etc? mine said no mixing coolant and no akaline coolants etc.

btw my eg>yours .

yes, well there were no problems prior to the radiator change and it isnt really displaying the symptoms of a bad thermostat but i will change it anyway.

nah no warnings, but i didnt mix coolants anyway.

yes we have to catch up soon. you, andy and i have to go out for a cruise sometime soon and put some of your photography skills to work

im guessing u whiched from a full size to a half size radiator? i have heard some theorys around that having a half size without anything next to it will cause air to flow around it instead of into the fins.... but thats just a thoery..

my guess is there are some bubbles in the system.. what kind iof overflow is it - is it hot as hell? does the collant look fresh in the overflow bottle, or off coloured.

Yes, i swicthed to a half size (more explained above).

The overflow is hot. Yes the coolant looks fresh, no discolouration whatsoever.

[iamhappy46]

Airflow, try and get a plate made up to block the air from finding the easier path past the radiator. Same theory as an intercooler, if the air can flow under the car or over the bonnet, then the intercooler ends up with heat soak.

If you have ever seen a Suzuki swift GTi, they have a metal panel on the drivers side for this exact reason.

Either way, good luck with it

[SKREMN]

i swoped my stock radiator to a smaller civic size but thicker custom radiator
I noticed the car sat a little hotter then normal
about 2mm more on the guage thats all

[MR-VTEC]

Airflow, try and get a plate made up to block the air from finding the easier path past the radiator. Same theory as an intercooler, if the air can flow under the car or over the bonnet, then the intercooler ends up with heat soak.

If you have ever seen a Suzuki swift GTi, they have a metal panel on the drivers side for this exact reason.

Either way, good luck with it

because of space restraints the fan is located on the front of the radiator, this too could prove to be an air flow problem, although it is run all the time.

i too think it is an air flow problem as this radiator has half the frontal surface area and the fan is far from flowing the required air in my opinion

[MR-VTEC]

i swoped my stock radiator to a smaller civic size but thicker custom radiator
I noticed the car sat a little hotter then normal
about 2mm more on the guage thats all

what guage are you reading your temp off?

my factory temp guage has not changed at all since the radiator swap?

i have a separate digital water temp guage and that is why i have noticed the 10 degree difference

[SKREMN]

i'm using the stock guage in my JDM cluster
Before it used to sit just before the picture of the thermo now it sits on the edge of it

[ECU-MAN]

maybe your new radiator is rooted, just kidding

was it a new radiator, eliminating cjanced of it having a few blocked cores

could be the charicteristics of the new setup, try changing to a cooler thermostat.

[iamhappy46]

Did you happen to wire the radiator fan to run in reverse now that it is located in front of radiator?? Once the fan is turned on, make sure you can feel the air being blown into the engine bay not towards the bumper or otherwise, it will not be very effective at all.