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I have noticed that there is a pressure leak and I see water dripping from the overflow pipe (or whatever it is?). Is this a replacement or a good crack with a hammer job? Thanks Nick

I saw this in the local DIY store. Are there any problems flushing a sealed system? Do I need to drain it completely? I assume that when I refill I will get a few air pockets and need to bleed all the rads?

Thanks, I'll try flushign it this weekend. Is it worth using a special radiator cleaning concentrate and then an corrosion inhibitor or is just flushing the system normally good enough?

Have a radiator that has gradually got colder over the last couple of weeks. Now it is not giving out any heat. At first I though it was the TRV, but there is some heat on the radiator side of the valve. Could it just be sludge? It is probably the lowes radiator in the house. Also, it is...