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Tips for bleeding air out of radiators?

post #1 of 9
Thread Starter 
I've just finished building the LCS in a new case last night, and I have a problem getting all the air out. This is my first build with more than 1 radiator, and also the first with radiators tied inside the case and not free-standing on top of it. And I gotta say, getting rid of air is every bit as hard as I was afraid it'll be.
Photo of the system (Click to show)

You can see a thin 280 mm rad on the right and a thick 360 mm rad in the top. And sometimes (rarely) I can hear there's still some air left in both. I can never get to see it in the tubing anymore.
I shook the case, I tilted it every side and put it lying on almost every side, short of those position when I risk air getting back into the pump inlet.

Any advice is welcome.
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post #2 of 9
As long as there's no major air bubbles, you should be fine. The tiny pockets of air should disappear over time with the pump pushing water through the system.
post #3 of 9
Take of the top of your res so the air can escape for the next few days. Pinch your tube (for a few seconds) on different location to create back pressure, that'll help in pushing air pockets out much easier.
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post #4 of 9
Thread Starter 
Thank you! Awesome tip with pinching the tubes, I never would have thought about it.
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post #5 of 9
One trick that I did is this. I have Alphacool radiators with 6 ports on each, so for the top rads, the tubes are connected to the ports on the bottom side - I screwed extensions into the ports on the top side, and stop fittings into those extensions. Essentially this is the same as opening up ports on the top side, with the added convenience of extensions' height, which helps avoiding spills.

Other than that, just rocking the case back and forth helps getting the bubbles out. And like others said, the bubbles dissolve with time.
post #6 of 9
If you can have the radiator unmounted, shaking and turning the radiator upside down and back upright will help dislodge bubbles. Also, despite the naysayers, and old trick is to add 1-2 drops, literally 1-2 drops, of dish soap. This will reduce surface tension, and help the bubble move. It will not effect cooling capacity or any thing. Also, lightly tap on the radiator to vibrate it, further agitating the bubble out of the radiator.
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post #7 of 9
Quote:
Originally Posted by pbasil1 View Post

If you can have the radiator unmounted, shaking and turning the radiator upside down and back upright will help dislodge bubbles. Also, despite the naysayers, and old trick is to add 1-2 drops, literally 1-2 drops, of dish soap. This will reduce surface tension, and help the bubble move. It will not effect cooling capacity or any thing. Also, lightly tap on the radiator to vibrate it, further agitating the bubble out of the radiator.
Soap can act as a surfactant, lowering the surface tension of water inside a loop. Heat can also lower the surface tension of water, the close you get to the boiling temperature the water vapor can coat the surfaces in the loop and aid in filling those voids with water.

That's also partly why you will see the water level go down after using the computer for a while after first filling the loop, and each time until the voids in the loop are full.

If you're brave enough, run the loop without the fans(or turn off/unplug a fan one at a time until you temps stablize at 70c) running for a while, all of the parts in a loop will thermal throttle if the reach an unsafe temperature, only run it like that for a few hours, turn it off shake the computer/rad a bit and run the pump again, do that a few times and have voidless rads.
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post #8 of 9
Thread Starter 
I think I'd need to cover the radiators in cloth for the water to reach 70C smile.gif Anyway, that seems a bit extreme since I'm pretty I only have very small air pockets left. But it is an interesting idea.
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post #9 of 9
Quote:
Originally Posted by Alexium View Post

I think I'd need to cover the radiators in cloth for the water to reach 70C smile.gif Anyway, that seems a bit extreme since I'm pretty I only have very small air pockets left. But it is an interesting idea.

So is adding soap when all you would have to do is wait and refill the res.
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