Most reservoirs (as opposed to a bottle at the end of a T-line) allow the water flow to slow down. Often that's a big help in removing bubbles. Sometimes it helps to re-orient the system a couple of times to remove bubbles from places where they're "caught" by gravity (air pockets), and you can also "burp" the system a bit by repeatedly squeezing and releasing a hose, so the water flow "pulses. Also, it's worth tapping the radiator with something hard to dislodge any bubbles that are stuck by surface adhesion.
Note that I'm usually doing this with watercooling-for-quiet systems, so it's with pumps at the low range (like the Eheim 1046 or 1048). The 1046 in particular, ahem, doesn't really move the water with a whole lot of force...
|