Coolant bubbling out of overflow bottle? - SR20 Forum
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Old 07-25-2005, 03:28 AM   #1 (permalink)
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Coolant bubbling out of overflow bottle?

So my buddie has a bluebird in his classic. the motor has been through hell and back.. twice.

we rebuilt the motor once, and this problem started.

turns out the head lifted, and the motor overheated.

so we pulled the head off, and had it re-surfaced.

new headgasket, with plenty of copper spray. and the damn car still gets hot, and water boils ouit of the overflow on the rad. checked the thermo, it was stuck open, so that doesnt explain the overheating.

the car has GTI-r ecu, injectors, turbo, mani, 3" exhuast, fmic, s-afc.


since its hot as hell recently, he removed the thermo completely, to see if that will do it. but i am wanting other ideas/explanations..

thanks fellas
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Old 07-25-2005, 03:34 AM   #2 (permalink)
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What condition is the water pump in? I would say its either a bad water pump or there is a problem somewhere in the radiator like lots of corossion or somthing blocking some of the coolant passages.

later,Jon
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Old 07-25-2005, 08:11 AM   #3 (permalink)
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A bad rad cap will cause bubbling in the overflow if it's not sealing correctly, or are you talking about actual boiling coolant in the overflow reservoir?

James
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Old 07-25-2005, 08:26 AM   #4 (permalink)
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Is this happening when driving or when standing still? I had a similar problem with my car, it was fine whilst I was driving and the air flow was keeping the temp down, but standing still it bubbled. I only noticed when I was parked up @ a buddys with engine running and heard this almighty noise which turned out to be the water boiling over into overflow tank, the cooling fans were not kicking in due to a blown fuse.
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Old 07-25-2005, 10:15 AM   #5 (permalink)
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water wetter
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Old 07-25-2005, 10:23 AM   #6 (permalink)
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blown headgasket.

What car you got this motor in? An NX? They're notorious for overheating issues. In my NX, I have a modine double core radaitor, no thermostat, and my OEM fans wired to run all the time (even when at speeds over 45 if I switch off the fans, my temp needle will instantly start to rise...) and I still have overheating issues on the highway or in light around town traffic.
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Old 07-25-2005, 12:15 PM   #7 (permalink)
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I had this problem in my SER. I had read mixed info on whether to swap out the JDM temp sensors. Initially they were working but then one day I was having extremely rough idling, then the temps skyrocketed, my overflow bottle was bubbling over, and my fans were not kicking on. I checked the engine over to make sure I hadn't damaged anything, only drove my car around the block, and immediately changed the JDM sensors with my USDM ones. No issues since.
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Old 07-25-2005, 01:53 PM   #8 (permalink)
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Classic sign of blown headgasket.
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Old 07-25-2005, 09:42 PM   #9 (permalink)
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update..
Well lastnight i pulled the themorstat out.. filled it up and started the car.
no water shot out and some bubbles came to the surface..
i added water and squeezed the tubes until it was completely full and it would stay
the water level would not drop. No bubbling from teh resovior (even though i think it only does it after i drive it for alittle bit) and it was not overheating
So i turned teh car off and went to bed.
Wake up this morning and there is a stream of water under it.
All the coolant is dripping out... You can see a small stream coming from behind the crank pulley onto the oil pan.
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Old 07-26-2005, 01:38 AM   #10 (permalink)
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That'd be a water-pump replacement then.

It isn't as hard as everyone makes it out to be, just pop the engine mounts on the side, jack it up with a board under the oil pan enough to tilt the engine and get it up enough so you can reach in and work on it. Use two 10mm wrenches and follow the procedure.

Replace your cap while you are at it if you have never done it before... if you want to upgrade get a cap for a Z twin turbo, or the Nismo one of course.
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Old 07-26-2005, 05:54 AM   #11 (permalink)
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Quote:
Originally Posted by Crim
blown headgasket.

What car you got this motor in? An NX? They're notorious for overheating issues. In my NX, I have a modine double core radaitor, no thermostat,
Put your thermostat back in. Your coolant is now circulating too quickly to be effective.

If you want to make it flow better, you can "cross-drill" the thermostat. Drill tiny holes every centimetre or so in the lip all around the edge and it will flow more coolant through, and remove the little loose fitting rivet in the top hole.

James
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