shut all hot rads at one end, leaving cold rads open, turn heating up to full it will push air lock out, then when they are hot open the other rads 1/4 of a turn at a time, see how hot they get, keep doing this until they are all even temp. your system does need to be balanced properly , but to much to explain on here check it out on the web plenty of sites that run through it.
hi-spec plumbing
February 2007