Terry D wrote:

snip

What you really need to do is to drain the whole system, then replace the
faulty valves and possibly also the rusty radiator. In order to ensure
against leaks, use PTFE tape around all threads Then flush the whole system
with clean water followed by a flushing agent (eg Fernox) to clean out the
system (this may need to be left in for a few days - follow the instructions
carefully). Then drain & flush the system again and refill, incuding a good
anti-corrosion inhibitor (Fernox again?).

snip

However, if one rad is rusty the rest might not be too clever either, so
be prepared that flushing might find more leaks
Which I suppose is a good thing, if you are ready to deal with them.

Lee
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