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Many thanks for the reply, the system is an open system,the water is black when I bleed off. I have not tried bleeding the system when it is cold, this i will try. How do I get rid of the black water throughout the system? I have heard of flushing agents, furnox etc but do I need to be aware of...

My central heating is very noisy which is a result of the radiators requiring constant beeding. The puzzle here is trying to understand why this only effects two radiators throughout the entire house. There are 6 rads upstairs and 7 downstairs. The two affected are one upstairs on the landing...