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Water pushing out the radiator!!

 
Old 09-11-2012, 05:23 PM
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Default Water pushing out the radiator!!

I had the car tuned and one of the logs showed spark knock throw the pull. And from then on, everytime the fans kick on it starts pumping water out the overflow and looks like smoke coming from the filler after the water goes down so far. I fear the worst ....

Has this happened to anyone else?

Any info. is appreciated...
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Old 09-11-2012, 05:32 PM
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Dang... that sounds ominous. When it's cool and you pull the radiator cap off, do you see oil in your coolant? Conversely, if you pull the dipstick, do you see foam/milkshake on your dipstick? Maybe your thermostat is stuck?
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Old 09-11-2012, 06:04 PM
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Pull the plugs and look for any odd color, especially bright white super clean plugs. If you find one put compressed air in that cylinder with both valves closed and the radiator cap off and look and listen for the air or bubbles. If you find something at least that will give you a place to start.
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Old 09-11-2012, 06:57 PM
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Lifted a head
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Old 09-11-2012, 07:30 PM
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Mine would push water out of the cap and overflow but only under boost. Pulled the heads and it turned out to be my driver side head that was lifting. I was on factory graphite gaskets, stock head bolts, and stock heads. If youre lucky, then there shouldnt be any damage. Pull the heads, put in ls9 gaskets and arp head studs and have at it again.

There was NO mixing of coolant and oil for me, so i figured i was lucky. I could see lil specs of head gasket in my coolant though.

If you are pushing coolant out of the resevoir at idle its gotta be a blockage in the system somewhere, probably your t-stat.
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Old 09-11-2012, 10:15 PM
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Thanks for the input, fellas. Now , I'm really freakin out...

This is after the switch to 317's (from milled 243's) and adding the Ls9 head gaskets and ARP bolts...

These are the same things I was told-a lifted head/blown gasket. And that's the reason for the swap.
Ah man.. I Will pull the plugs again, and do a closer inspection.

But, the water only seems to push after the fans cam on... Then keeps up til the water level drops and fan go off....Damn I don't know...
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Old 09-11-2012, 10:22 PM
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Btw. This is Iron block 347ci. forged with a custom blower cam and a F1 procharger. But, the issue is before any boost.

Thanks again
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Old 09-11-2012, 11:14 PM
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It might be overfilled and purging the extra water. I would see if the water level stays consistant once it pushes the water out of the overflow.
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Old 09-12-2012, 01:56 AM
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Originally Posted by mike13 View Post
It might be overfilled and purging the extra water. I would see if the water level stays consistant once it pushes the water out of the overflow.
+1... It is really hot now and my radiator pushes out some water sometimes. Buy a new radiator cap and try it; caps go bad all the time.
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Old 09-12-2012, 05:01 AM
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The fans coming on may just be because the engine temp happens to reach the threshold at the same time the water is boiling. How hard is it to pull the thermostat on an LSx? As an inexpensive test, I'd pull the thermo out and run it without it just to see if the boiling still occurs. I've certainly had 2 cars in the past where the thermo spontaneously went bad and would boil the coolant out. The day before the issue the car had no problems. I hope it's something as simple as that. Best of luck chief!
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Old 09-12-2012, 07:49 AM
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stick the line coming from the radiator cap into a clear container of water so the hose is submerged....

start car and see if you are getting air bubbles.....
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Old 09-12-2012, 08:14 AM
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The thing that gets me, is the temp gauge is just at like 170ish when the fans come on. But is blowing out with the cap off still...?
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Old 09-12-2012, 08:16 AM
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I'll try that ...
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Old 09-12-2012, 08:37 AM
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Try doing a pressure test. It's very easy to do. Just rent one of these kits
Amazon Amazon
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Old 09-12-2012, 10:45 AM
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I used to have that problem on my V6, temp fix was to lower the coolant level in the rad, and get a rad cap higher than the boost level I was running....lol
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Old 09-12-2012, 11:18 AM
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Thanks everyone for all the replies, the car is mine and I appreciate everyones help to solving my issues here.
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Old 09-12-2012, 12:26 PM
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Originally Posted by WSLN 6 View Post
I used to have that problem on my V6, temp fix was to lower the coolant level in the rad, and get a rad cap higher than the boost level I was running....lol
I read this about 3x trying to figure out if this was a joke. Then I read 'temp fix'.

Yikes.
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Old 09-12-2012, 05:30 PM
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I did the pressure test today... Holds pressure @18#'s . I then pulled the plugs and spun the engine manually to see if I could find a leak in the cylinder... nope. Then i tried to pressurize the cylinders and still nothing, no bubbles in the radiator or anything... dammit!!

Oh, I also pulled the t stat altogether ... and it still did the same thing.

next thing I will try is pulling the hoses add flush the radiator and make sure the waterpump is moving the water correctly... Idfk...!!!

Last edited by 383vert; 09-12-2012 at 05:54 PM.
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Old 09-12-2012, 07:17 PM
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Uh boy.. I hate these kinds of issues where there's no (obvious) logical reason for the problem.
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Old 09-12-2012, 08:28 PM
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Originally Posted by 383vert View Post
I did the pressure test today... Holds pressure @18#'s . I then pulled the plugs and spun the engine manually to see if I could find a leak in the cylinder... nope. Then i tried to pressurize the cylinders and still nothing, no bubbles in the radiator or anything... dammit!!

Oh, I also pulled the t stat altogether ... and it still did the same thing.

next thing I will try is pulling the hoses add flush the radiator and make sure the waterpump is moving the water correctly... Idfk...!!!
How much pressure did you put into the cylinders? Use the hose off of a leak down tester and hook it up to your air compressor hose.. 150+ lbs is best. If you have a breach in your head gasket this will find it.
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