Overheating problem

[oneSICsvt]

So i just bought an s13 coupe. Had no trouble for about a week then it started overheating. I changed the thermostat and radiator. I finished putting in the radiator and i took off the ghetto rigged electric fan and i drove it around for a bit. The temperature stayed at about normal but coolant still overflowed into the coolant reservoir and overflowed it and got coolant all over the ground. What do you guys think the problem could be. Im a 240 noob. I have heard of the trouble with bleeding these cars coolant system and my bleeder screw was snapped off in the housing on the intake so that wont work. Is it something as simple as air pockets in the coolant and me not running the fan?? Thanks for any input

[Edwin562]

if cooling system aint properly bled, you will have overheating issues...

[oneSICsvt]

I bled it for a bit and then drove it. It stayed at a cool temperature but still shot coolant overflowing the reservoir. Is that a sign of air in the coolant??

[oneSICsvt]

Either that or it could be a bad radiator cap because the temp is staying normal but pressure is just building. It is stock radiator cap

[260sexways]

You have to have a fan otherwise it'll overheat extremely fast at slow speeds and you could possibly warp the head or damage internals, put a fan back on before you try to diagnose anything else.

the bleeding issue really isn't bad...
1.Loosen the bleeding screw enough so air can seep through (barely threaded)
2.turn the car on and coolent should start seeping through after it reaches operating temp.
3.Try and release air pockets in the hose by squeezing it.
4.Do this process for about two min from the time coolent starts coming out.

[Boost_Fiend]

You probably just have air in your system. Take off the radiator cap and run the engine. Do this for a couple minutes. You should see bubbles. Add to coolant to radiator if necessary. Some people recommend jacking up the front end of the car.

[bb4_96]

Did you just say you arent running a fan?

[oneSICsvt]

Well im in the process of takin off my e fan and getting a mechanical fan and i still drove it. But the temp gauge stayed at normal operating temperature but coolant still boiled overflowing the overflow

[260sexways]

Coolent temp sensor might be bad

[DoobieS13]

if temp is not rising could be temp sensor if it actually IS overheating. If not, def need to tap out old bleeder bolt, rethread, and put bigger bolt AND washer. Also with bleeding, no one has mentioned, Nissan convientally placed the top of the radiator cap AND bleeder bolt on intake mani at the same level. I unbolted my rad, when it got to op temp it started bubbling out the bleeder, than take ur rad and lift it until the top of the rad is higher than bleeder, or until it spits out a STEADY stream from the bleeder. Put bolt in intake mani, put rad cap on, lower it, and bolt it in. If that doesn't work, water pump? If not, like mine, blown head gasket. Even if there is not a milky substance in the oil, doesn't mean anything. Mine was fine and my compression was 95 95 95 93. Blown head gasket and warped head by .016 or something like that. Good luck bro. BTW glad u picked a Nissan and keep it clean. No rice.

[nismo240sxkat]

first u need to fix the bleeding screw on the intake manifold so u dont have any air in the cooling system.second with the car running and warm check touch ur radiator on top and bottom to make sure they both hot be carefull cuz ill be hot if is warm on top and cold on bottom ur water is not flowing threw the motor.
If all is right then its most likely ur head gasket. let me know how it goes.

[oneSICsvt]

coolant temp sensor is fine. when it was overheating it was really hot. I just replaced the cap and it stopped overflowing into the coolant reservoir. I drove around and it was fine but when i stopped it started to go up again. but that is because i have no fan lol im getting a fan soon and i will put that in and see how it goes. thanks for the help guys. I will be dealing with the bleeder screw issue asap because all i have heard is how much a pain in the ass it is to bleed these KA motors

[steven37]

quick question im new to the 240 and i jus got it fixd managed to get one for 1g but wit a blown h.g that got fixed they put in a new thermostat n it overheated my friend told me bout bleeding it but iono wer the bleeder is at...

[blackcoupe954]

How do u fix the bleeder screw?!?!

[steven37]

what engine do u have???ka24de o ka24e???

[d_nice]

never had this isue until i have flush the radiator bc it was dirty. i have fans on it..i have a ka24de...i just flush my radiator but i never unscrew the bleeder when i added the coolant... now its overheating...will this cause my overheating..and how will i know the air is out of it completely when i unscrew it..

[RyanS13]

You need a fan before anything, so get one of those before you try diagnosing the rest of it.

You don't even need to bleed the car from the bleeder screw. Just go park your car on a hill, or driveway, or jack it up, so that the front end of the car is higher than anything else. Then just pull off the radiator cap and turn the heater on full blast, and run it for like 10 mins. That will get all of the air out of the system.

If your car still over heats after this, then check the radiator cap to see if it is holding pressure in the system, because if the cap fails it would stick open, and just let the coolant flow out of the overflow. You could check if its working by starting the car with the cap on, and let it run for a little and then squeeze the upper radiator hose, it should have pressure in it and be hard to squeeze, if not then there is no pressure in the system and its just pushing coolant out of the overflow.

If the radiator cap is good, you could have a blown head gasket. It could be leaking air from the cylinders into the coolant and building up too much pressure to the point where it begins to be pushed out of the overflow. I've had this problem, and it sucks. I never had coolant/oil mix in my car when it blew the head gasket, it just kept pushing coolant out of the overflow.

But I've also had a radiator cap fail on me, and it would do the exact same thing that your describing.

[d_nice]

Thanks Ryans13...I will try this and let you know the out come.

[s13 @ fullboost]

take it to a mechanic

[steven37]

dude i had the same problem all i did was change the fan clutch and it was fixed

[Promise Land]

I had my upper hose attachment to the radiator break off this past week. I was able to get it close to home but pegged the needle HAWT. Got it towed to the house, was able to get the hose connected enough to fill the system and run the car. I have a new ISIS radiator on the way. It doesn't show any usual signs for a blown head gaket (milky oil, smoke from the exhaust, etc.)

The car sputters now off idle at 800rpm but clears up at 1100. If I run the A/C, it has no problem due to the higher idle. Anyone have a guess why it has a small sputter? I haven't check anything else yet because I'm waiting for the radiator to arrive this week.

[Shift n Drift]

its a blown headgasket

when the cylinder fires, the compression and heat seep though the gasket into the coolant passages causing the over pressure. the compression seeping though the gasket is pushing the coolant out the over flow and the heat from the cylinder is causing it to bubble.

your welcome and good luck

[zylvia213]

Dont jump to conclusion of it being the head gasket just yet and start doing major replacing cause you will just waste your money.

I would go back to fan clutch and shroud. There is plenty of write up on how to bleed the cooling system the proper way. I bet you have an air pocket in the system thats causing this.

[d_nice]

ok ...so i already put it up on the lift and let the air out and still over heat. i just replace the cap and illlet u know the out come..

[d_nice]

well fix my issue..cap was the issue..thanks all even thou it was not my post..Thanks for helping all.