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2 new radiators not reaching full temperature?

Having fitted 2 new radiators (one replacement and one extra) both radiators are cool at the bottom but hot at the top. All other radiators seem ok. The extra radiator is connected by hep20 at15mm over a 6m pipe run. All the radiators have been bleed.
doug, February 2010
loj;'klj';ok

zadx, February 2010
both valves on both radiators fully open

doug, February 2010
have you fully opened both end valves on each rad?

A1, February 2010