My Ka Overheats =0(

[Mikey213]

When i drive my temp guage would rise all the way to the top and stay there for about a min then itll go back down to normal temp... then itll rise up again the next 20-40 min and over n over I don't know what the problem is. =0( As it overheats i notice the rpms raise up just a mm above 1,000rpm I have a koyo rad, nismo thermostat, and new belts. Is it the water pump? i have a cheap ass autozone radiator cap.... or could it be that my lower chain guide is cracked and itll randomly slows down the chain causing it to heat up a bit?? i hope it's etheir of those and NOT MY HEAD GASKET (http://www.zilvia.net/f/showthread.php?t=181829#) =0(

[Dampachi]

hey same here, as soon as it got warmer here it will do it if i am sitting for more than two minutes. I am bone stock though, but i think its the thermostat just being a pile. Check if it only does it on inclines thought cause then it could be your thermostat not reading and not putting the fan on. Thats my best guess.

[forgottenpromize]

if i was you i would change the temp sensor first and see if it still does it.. its only like a $6 part at autozone... if that doesnt do it i would start at the rad cap and replace that next then move on to the water pump.. but normally if the water pump is bad they tent to leak... i know my ka would heat up and then cool down when i would stop for a lil while and idle and my head was warped .008 between cylinders... just some advice to try to help you out man

[KA-T_240]

Do not just throw money at it. Even $6.

Test your Water Pump, thermostat and do a compression test. Also look if you fan is working and that your radiator is flowing.

[sofo259]

get a thermostat, wouldnt hurt to change it.. temp sensor sounds about right tho..

[Mikey213]

i got a new nismo thermostat already. Im gonna buy a radiator cap and if that's the problem. BTW the only fan i have is the clutch fan.....

[jhec23]

Check your clutch fan too, the clutch mechanism maybe be broken too and not engaging properly.

[Psycho 240 Freak]

Have you gone through the basics. Like bleeding your coolant through the bleeder screw and making sure you've gotten all the air out of your cooling system. It's a very common issue with our cooling systems.

[ill_concepts]

is you radiator losing coolant? if not then it not the head gasket. I agree with KA-t 240 troubleshoot before you go buy abunch of crap. Its easy to pressure test. Check temp sensor connection could be lose. Good luck

[wangan_cruiser]

i had that prob too. jack the car up as high as you can open the rad cap then let it run for 15 mins. bubbles should come out keep filling coolant until the all the bubbles are gone. check your thermostat if its working properly even its brand new it wont hurt you checking it. you can check your thermostat by boiling a water and dip it in a certain temp to see if it opens up. check your waterpump for any play in and out for the bearing. any white smoke coming out from the muffler? do compression test too.

[Mikey213]

ok i check my thermostat its good. Got a new rad cap, when take the rad cap was off and I let it run for a bit coolant would slowly rise or overflow and just cum its way out (is that why you jac the car all the way up?) I have a feeling it's because there's air in the system. Maybe my dumb newb ass put the coolant in wrong. After i drained all the coolant out, I put the drain screw back and fill it up (while the bleed screw on top is off) then when it's filled i put the bleed screw and the rad cap back on. Is this right? It has to be because there's air in the system. Because it's not my head gasket, not the thermostat, it should be the water pump cuz it wouldn't have these type of symptoms. Im just so confused with this because im used to FFSRs where u have to remove more screws like the drain block etc.

[bbejj123]

Have you gone through the basics. Like bleeding your coolant through the bleeder screw and making sure you've gotten all the air out of your cooling system. It's a very common issue with our cooling systems.


^^^ make sure of that first

[Skaterg240sx]

yeah check the basics because i went trough the same thing also...(T_T)

[Helghast]

You checked your thermostat without checking your water pump?
Is that even possible?
In order to see the thermostat, you need to pull out the water pump.
..am I wrong here?

Overheating is simple.
The cooling system is basic too..
Water pump + Thermostat + Radiator + Fan (clutch or Electric)

Fucking replace em ALL!
cost no more than $200, I'm sure.

[Mikey213]

wow, u don't need to take ur water pump off to get to the thermostat... there's somthing called a thermostat housing, and i did the boiling water method... but yeah some one explain how to bleed air out properly, just want to make sure i know that it's the problem

[S13_SideWayz]

ok i check my thermostat its good. Got a new rad cap, when take the rad cap was off and I let it run for a bit coolant would slowly rise or overflow and just cum its way out (is that why you jac the car all the way up?) I have a feeling it's because there's air in the system. Maybe my dumb newb ass put the coolant in wrong. After i drained all the coolant out, I put the drain screw back and fill it up (while the bleed screw on top is off) then when it's filled i put the bleed screw and the rad cap back on. Is this right? It has to be because there's air in the system. Because it's not my head gasket, not the thermostat, it should be the water pump cuz it wouldn't have these type of symptoms. Im just so confused with this because im used to FFSRs where u have to remove more screws like the drain block etc.
i had a similar problem.. i just took out my thermostat.. and did the whole bleeding screw thing and well its been running fine for a while.. i know alot of ppl dont agree on having no thermostat. but w.e works for me. try that and c wat happens...

[Mikey213]

ahaha i am one of those people who don't agree with running no thermostat

[ms!3]

i had a similar problem.. i just took out my thermostat.. and did the whole bleeding screw thing and well its been running fine for a while.. i know alot of ppl dont agree on having no thermostat. but w.e works for me. try that and c wat happens...


that ok if your just doing that to see if you have a bad thermostat. You have a thermo for a reason tho.

[Helghast]

wow, u don't need to take ur water pump off to get to the thermostat... there's somthing called a thermostat housing, and i did the boiling water method... but yeah some one explain how to bleed air out properly, just want to make sure i know that it's the problem

Oh really?
That sucks.

I must of been thinking of the 22-RE.

:down:

[nathancolston]

i had this problem with two of my 240sx's. the first one it turned out to be the thermostat. as for the second one... shortly after it started doing it the head gasket blew. it was on cyl. #4 once i replaced the head gasket it never did it again. so i would check comp. just to be sure. it would knock one thing off the to do list.

[Mikey213]

true, what are symptoms of a blown head gasket?

[Moon Ill]

that ok if your just doing that to see if you have a bad thermostat. You have a thermo for a reason tho.

Running w/out a thermo isn't all to bad. The theromstat opens up to let coolant(mix/whatever) run through the engine.

If you take it out it just means that you'll have fluid running through all the time. I don't see it being a problem unless you live in a place where it gets chilly.

[jesse5150]

I am having the same problem with my 91 right now, I replaced the water pump, thermostat, coolent temp sensor, temp switch, RADIATOR, and hoses...bled system but didnt seem to work.....not sure if im doing it right tho. The book i have says take out bleeder screw and pour coolant in...and i also tried idling the car with the bleeder screw out for about 20mins but the car was not jacked up, would that make a difference??

[DreamN]

Yes, it would make a difference. Make sure you jack up the front of the car and run the heater on full blast. Each time you do work to your cooling system make sure to bleed it properly.

[240esux]

if its your headgasket, you can check your oil to see if its milky.

[jesse5150]

Yes, it would make a difference. Make sure you jack up the front of the car and run the heater on full blast. Each time you do work to your cooling system make sure to bleed it properly.
Ok, i dont want to sound dumb and i appreciate your help with this, but ive tried bleeding it so many times i just want to make sure i do it right this time. So I'm going to jack up the front of my car as high as i can, then with the car running,radiator cap and bleeder screw removed, run the car with the heater all the way up until all the bubbles stop coming out of the bleeder hole, while making sure i keep the radiator filled with coolant. RIGHT? please let me know if im missing anything. Thank you