Engine overheating

[Options13]

I have an s14 with a 1jz in it and recently it just started overheating and not really sure why?

The car warms up just fine, and you can let it sit and idle and it won't go over 90 degrees Celsius. If i go on a drive and let it sit at a long red light or let it idle, it will start to over heat and head towards the 100's..

I did a track day yesterday, and halfway through the track my car was hitting 110 degrees Celsius. I couldn't go one lap without the car overheating..

I have a koyo radiator, and 2 10" radiator fans wired to my ignition. The only thing that i think it could be is maybe that i am running no coolant over flow tank? i'm just running a hose to the side of my car, so maybe air is entering my coolant system?

it recently started doing this, i used to rail the hell out of the car and it was fine, no overheating.

I already tried removing the thermostat and running it on the track, and it didn't help much at all.

Any help would be great.

[Chaluska]

Originally Posted by Options13

I have an s14 with a 1jz in it and recently it just started overheating and not really sure why?

The car warms up just fine, and you can let it sit and idle and it won't go over 90 degrees Celsius. If i go on a drive and let it sit at a long red light or let it idle, it will start to over heat and head towards the 100's..

I did a track day yesterday, and halfway through the track my car was hitting 110 degrees Celsius. I couldn't go one lap without the car overheating..

I have a koyo radiator, and 2 10" radiator fans wired to my ignition. The only thing that i think it could be is maybe that i am running no coolant over flow tank? i'm just running a hose to the side of my car, so maybe air is entering my coolant system?

it recently started doing this, i used to rail the hell out of the car and it was fine, no overheating.

I already tried removing the thermostat and running it on the track, and it didn't help much at all.

Any help would be great.

almost sure you need a coolant overflow tank... for expansion and contraction of the cooling system

[zurud]

You need to put coolant in your car

[cotbu]

Run the hose in a bottle of water to test your theory. check timing and everything maintenance. Don't track your car if it's not 100.

Our rinky dink track, doesn't allow antifreeze, water wetter, or 50/50 mixes because all we have is a flame thrower and kitty litter. just saying! #the struggle

[JBB]

You were overheating at a red light and decided to track the car?

[Javi802]

Have you done a compression test...?

[pacotaco345]

You got it hot one time, and some coolant boiled out. Since you don't have an overflow that coolant was never sucked back in and now you have air in the system. Since you don't have as much water in the system now your car overheats. Get an overflow and bleed your system out.

[Options13]

thing is i let the car idle for like 20 minutes the night before the event and it didn't over heat at all.. its after it DRIVES slow it will start to get hot, like i must be on the highway for it to not over heat.

What does a compression test have anything to do with over heating?

Also note that my radiator cap is a $10 radiator cap from autozone.. not sure if that makes a difference, but I am going to put in a new thermostat, and run the line from the radiator into a bottle with water in it to see if this will cure my issue.

[So Make Like]

even an autozone radiator cap is designed to release at the temperature from oe specifications. unless it's old, it shouldn't matter. i recommend running it without the thermostat with the overflow hose in a container of water first, thus eliminating the possibility of the thermostat making you think the overflow hose in water wasn't doing anything in the case that it was stuck closed. don't forget to bleed the system of air again before test driving this "fix".

with the compression test, i think he was getting at the fact that a blown head gasket can cause over heating; even though unlikely, you asked for everyone's two cents by posting lmao.

[Javi802]

pacotaco made a good point.. You overheated once, radiator became over pressurized and the cap released all that pressure.
But rather then being pushed into a reservoir and sucked back into the system it was pushed out of the system and only air pulled back in.

And yes, a bad head gasket seal will cause overheating... And over heating due to whatever other reason can cause a head gasket to go.

Do what paco said and put a reservoir in, add coolant and bleed the system really well.

I would also leave the thermostat in

[da_crew10]

Originally Posted by pacotaco345

You got it hot one time, and some coolant boiled out. Since you don't have an overflow that coolant was never sucked back in and now you have air in the system. Since you don't have as much water in the system now your car overheats. Get an overflow and bleed your system out.

This

[jr_ss]

Originally Posted by Options13

thing is i let the car idle for like 20 minutes the night before the event and it didn't over heat at all.. its after it DRIVES slow it will start to get hot, like i must be on the highway for it to not over heat.

What does a compression test have anything to do with over heating?

Also note that my radiator cap is a $10 radiator cap from autozone.. not sure if that makes a difference, but I am going to put in a new thermostat, and run the line from the radiator into a bottle with water in it to see if this will cure my issue.

Your car idled for 20mins with no load, that doesn't mean shit. Driving the car loads up the engine and drivetrain creating more heat. The harder or faster your drive, the more heat builds up. When you're on the highway, you have sufficient airflow going through the radiator to quell that heat, but at lower speeds there isn't adequate flow causing you to overheat.

Do you have proper or factory ducting? If not make some. Autozone sells cheap overflow tanks, buy one, mount it and throw you garbage in the trash where it belongs. Rebleed your coolant system and update the post when you have.

[silviasandbeer]

your missing a piece to your cooling system and wondering why your overheating

[Options13]

thanks mods to deleting all the bull shit..

Thanks guys, i'll get back to you..

I don't understand because in the winter time i would RAIL the car and it would not creep over 90 degrees C at all. i got the manifold red hot at one point, i had no issues with over heating..

anyways i'll put in an over flow tank and check back in with you guys, if it's fixed i'll be sure to pop rev limiter for you guys in a video lol

[aga]

even 2litre sr's tend to overheat even with aluminium radiators, your 2.5 wouldnt?

you need a BIG radiator, good fans (either pull if you have space, or push if you don't) , of course an overflow tank, a coolant swirl pot helps too, and PROPER DUCTING to the radiator.

[EvoVIII808]

i recommend upgrading the fans as well. 2 12" fans is what I'm running with a triple core Haste radiator and have not been over 74c. I run 68-70 during normal driving.
But to answer your question as many have, you need the coolant Res to catch the expanding fluids.

[Options13]

turns out my fans were wired backward, i.e pulling air from the engine bay to the radiator...

GG

[aga]

well, good thing you found it...