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Old 10-13-2008, 02:49 PM   #1 (permalink)
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Default Cooling Issue-Any Suggestions

My weekend car has shown this weekend what has been causing it to run a little hotter. Turns out the issue was the radiator/radiator cap taking a dump on me.

The car is a 1999 Civic Si-Has a B20/VTEC with a greddy [email protected]
Makes 285whp

My question is this:

Currently had a Fluidyne half size dual core radiator with 12'' flexalite fan-but radiator went bad. So what radiator should I replace it with? Can I just go OEM radiator? Or do I need a dual core again?

I ordered a HKS 1.3 Bar radiator cap to help as well. I will continue to use the flexalite 12'' fan, but dont know what radiator to use.

Any input is appreciated

Thanks
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Old 10-13-2008, 02:53 PM   #2 (permalink)
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how did the radiator go bad? is it clogged? never heard of any issues with fluidyne especially on such a new car.
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Old 10-13-2008, 03:35 PM   #3 (permalink)
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I know, it has me stumped too. It may be just the radiator cap.

If the radiator cap went bad, would it also cause the car to get hot quicker?

I am replacing the radiator cap first, but if that doesnt fix it, then I am looking at the radiator as well
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Old 10-13-2008, 03:37 PM   #4 (permalink)
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Another odd thing is that the upper hose is always way hotter than the lower return line from the radiator. Could this be due to a clog in the radiator? If so how do you go about flushing the radiator? Never had to do this before?

I do know that the radiator is somewhere around 5 or 6 years old as well. And the car was a Arizona car for most of its life if that would do any damage to it as well
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Old 10-13-2008, 03:42 PM   #5 (permalink)
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i would change the thermostat and then see where your at,
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Old 10-13-2008, 03:48 PM   #6 (permalink)
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Lol yeah just replaced the thermostat about a week ago. And the cap on order.

Being a B20 bottom, there is no bleeder valve for the cooling system, so, I am wondering if I didnt get all the air bubbles out of the system.

To bleed it I have to put it up in the air with the radiator cap being the highest point and squeeze all the air out of the lines that way, which sucks alot
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Old 10-13-2008, 03:49 PM   #7 (permalink)
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i would def look at a thermostat before a radiator. and im positive thats your problem
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Old 10-13-2008, 03:50 PM   #8 (permalink)
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Since it isnt the thermostat, what do you recommend next?

Also forgot to add that it isnt overheating yet, but when under boost is when it starts to spray antifreeze from somewhere around the top of the radiator and the fan causes it to be sprayed
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Old 10-13-2008, 03:51 PM   #9 (permalink)
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i would def look at a thermostat before a radiator. and im positive thats your problem
If it is the thermostat, did I install it wrong? I mean I just changed that like a couple weeks ago
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Old 10-13-2008, 03:52 PM   #10 (permalink)
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or you can drain al the coolent, refill it til your radiator is full, turn the car on, heater on high, and when your thermostat opens, add more, burping the system.. leave radiator cap off... and try some antfreeze additives, that work very well for me
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Old 10-13-2008, 03:52 PM   #11 (permalink)
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where did you get the Thermo from? autoshit? advance autoshit? also you took cap off radiator, and turned heat on and let it idle to full temp when installing it? ive never heard of a radiator going bad unless its cracked..lol flush it.
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Old 10-13-2008, 03:53 PM   #12 (permalink)
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Quote:
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Since it isnt the thermostat, what do you recommend next?

Also forgot to add that it isnt overheating yet, but when under boost is when it starts to spray antifreeze from somewhere around the top of the radiator and the fan causes it to be sprayed

ok, so now your include more helpful info.... sounds like headlift to me.

are you using arp's?
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Old 10-13-2008, 03:54 PM   #13 (permalink)
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yep sounds like some headlift. if you running ARP what did you torque them to? and you used lube right? is your overflow box nasty looking? or fill up alot?
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Old 10-13-2008, 03:58 PM   #14 (permalink)
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lol it just info that I forgot until I thought about it.

I dont know honestly about them. I would think so, but not sure. I bought it built this way. I know it has Arias forged pistons/Eagle rods/ and ITR Cams with skunk2 valve springs and retainers.

Also had a cometic head gasket as well.
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Old 10-13-2008, 04:00 PM   #15 (permalink)
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The coolant overflow? no it looks very clean. I wish I knew if it had arps or not.

He had the work done at a shop, so that why I also would assume that they were arp's and torqued down tighter as well.
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Old 10-13-2008, 04:01 PM   #16 (permalink)
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The head gasket was checked last week and checked out good. and no exhaust gas in the coolant either. If this helps also.

Since this happened I have turned boost down to around 9 psi.

I havent drove it since either
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Old 10-13-2008, 04:09 PM   #17 (permalink)
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well, headlift could only be at higher boost levels.. and if the bottom end is built, im hope they didnt cheap out on some head studs which im sure they didnt. i say turn the boost down, and run it... if temps are fine, turn the boost up... if temps go up, youve found your problem.
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Old 10-13-2008, 04:11 PM   #18 (permalink)
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However also this is the first time I have actually seen anti-freeze that has seaped out of the radiator. I assume it to be from being under boost. But as it is the first time I am not sure of this.

Is there something i can do to check to see if it is indeed the heade lifting?

I am planning my course of actions to be- replace the radiator cap/flush out the radiator/then bleed the system again. And see what happens. and also leave it around 9psi until then.

Any other tips?
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Old 10-13-2008, 04:13 PM   #19 (permalink)
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well, headlift could only be at higher boost levels.. and if the bottom end is built, im hope they didnt cheap out on some head studs which im sure they didnt. i say turn the boost down, and run it... if temps are fine, turn the boost up... if temps go up, youve found your problem.
Basically at low boost if my temps are ok, then increase boost.

If this in turn raises teh temps-then head is lifting and I need to get ARP head studs and torque them down appropriately?
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Old 10-13-2008, 04:17 PM   #20 (permalink)
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again what brand thermostat did u put in and what temp?
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