if the rad is the highest, best bet (if it's not too inconvenient) is to take it out and lay out WC system so the rad isn't the highest and let it run overnight. I've always had my rad highest, and its a bitch to get all the air out when installed in the case (I'm usually forced to leave the PC on its backside overnight w/ the T fill tube sticking up (rad is then sitting on its side with outtake barb highest). Either that or give the PC a good shake every once it awhile to get the air out of the rad.
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