Originally Posted by Efnita
Hmm. Pump normally makes lot of noise when you run air (bubbles) through it. Once system is air-free it quiets down.
The way I get the air out of my system is by running the pump at max and tilting the case gently, until you hear the air move. If there is a big air pocket you will hear it when it dislodges and see the air appear in the tubes. What works best in my experience is tilting it forward and backward with the reservoir closed. No need to rock it back and forth just gently increase the angle until you hear the air moving. I will then put the case level and run it for an hr or 3 with reservoir open to remove smaller bubbles, then rinse and repeat. I typically also run it overnight with res open just to remove the tiny bubbles.
Everything he said was correct except one thing.
There is zero reason to ever leave your res open. It does not allow air to escape from the loop like many state, it just gives the system a source of potential leak.
The reason is that air coming out of someplace like the rad is going to get replaced by liquid from the res, and the water that replaces the air will make room for that air in the res.
You are simply moving stuff around within a closed loop, so no need to open the res up while running the loop.