woodsmith
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Yes it does sound like your radiator is blocked up but I would possibly replace the radiator rather than flush it out. It depends on the condition of the rad, with so much magnetite in the rad (this is basically dissolved steel from the rads) it may have worn thin. Look for any external signs of rusting along the seams at the bottom of the rad and if in doubt replace.
It’s a difficult call when you are working on a job, I often spot other things wrong but rarely say anything unless it looks desperate. Customers can think that you are looking to inflate the costs for them.
With your system, especially with it having already been blocked, it would be wise to fit a system filter like a Magnaclean if you don’t already have one.
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