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How can I isolate a leaking radiator?

Posted 17th Dec 2014
One of our radiators is rusty and is leaking. It doesn't have a thermostatic valve (the only one in the house without one), and I'd like to stop water getting to it so that we can use the remaining radiators without all the water dripping out of the system while we sort out a plumber to fix it (which may take a while at this time of year).

I've closed the two valves on the radiator, and the rad is completely cold while all the others heat up, but it seems to still be dripping. What else do I need to do? I assumed that closing the two valves would stop any more water getting to it, but I guess I was wrong...

Any advice?
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