Too many air bubbles in H2O sytem :/

[Fluxer]

I finally received all of the items for my H2O water cooling system so I put it together today. I put the following things together over the sink:

1. 3/8" silicone tubing
2. Eheim 1250 pump
3. Swiftech MCW462-U Water-block
4. Heater Core with 3/8" fittings from Danger Den
5. "T" connector right before the radiator to bleed air and add water
6. In the following order: pump -> block -> "T" for bleeding air -> rad


After setting it all up, I got the water to pump the distilled water through the system. What I got was a noisy pump pumping water and air bubbles through the system. After about 2 hours(!) of trying to bleed the air out, I have not been successful. The water is flowing through the system, I can actually see it moving fast. All of the air bubbles seem to be originating from one spot: Where the 1/4" tubing from the waterblock pours into the 3/8" tubing. It seems that in this spot, there is a small jet of water pouring in the big tube meaning that there is a small amount of air in the areas that the water is not pouring into. I have made sure there are no air bubbles stuck in the radiator and the waterblock by shaking both of them. I have no clue what to do but i'm going to bed now.

 

[Neco]

Are you using hose clamps ?


and have you tried filling the system with the pump submerged ?

I thought you could do that with Eheims, but if you haven't, make sure it's safe before you try it

 

[Barryng]

When I first lit off my cooling system I had the same problem. Although I had a high point vent, there was a small and constant stream of tiny bubbles that I could see through the hoses.

It took about 24 hours for this stream of bubbles to dissappear. I assume the air off gassed through the high point vent but it could also have been absorbed in the water. In any case, there is now no visible air and the system seems to have outstanding heat transfer capability so I am no longer concerned about them.