txtsd

...is it okay to close the reservoirs, thereby making the loop air-tight, before finishing leaktesting?

_AKIMbO_

When I was first setting up my loop I made sure to properly bleed all the air out the res before sealing the res up. However, I don't see a problem with sealing up the res before you have finished leak testing so long as you have bleed most of the air out of the loop.

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txtsd

yes it's been running for about 3 hours now, and there's just a bunch of microbubbles left around.
looks like i can seal up and ignite this *****

_AKIMbO_

So seal her up and let that CPU feel the burn (ur' I mean cold )

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nub

Should post a pic or two of your rig

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txtsd

http://www.overclock.net/water-cooli...k-warning.html

xfob

I let it run over night unsealed, and most of the those little bubbles went away too. It does help a little with the heat with less bubbles.