Yes that's right Richard, just the plain cap with no holes. There is also nothing in the neck of the radiator as someone has suggested I look for the pressure assembly, I am trying to reduce the size of my photo's but don't seem to be having much luck. When the pressure releases the water must just come out of the top as there is no seal as such but there is no overflow or should the cap have holes?
Thanks for your help on this,
Paul
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