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how do you take the air out off a radiator?

the radiators in my house are cold in oarts of them and i would be grateful if someone could tell me how to get the air out without making a mess? the radiator has a pipe going in on both sides and they are new? there is no unlocking thing at the top like the old radiators to blead them.
louise law, January 2005
There should be a small screw (or bolt) in one of the top corners of the radiator, you need to 'crack' it open half a turn until you hear a pssssssssssssss.

Once this noise stops, recharge your system.

Karl, January 2005