"Dave Liquorice" wrote in message
ll.co.uk...
On Tue, 26 Jan 2010 13:38:57 -0800 (PST), JimK wrote:

intriguing - pinholes at the top of rads??! - only ones I've ever
dealt with (tho not many) were at bottom near either valve...

I've had 'em near the top in the face of the vertical "tubes" and the
horizontal top "tube". I suspect that the system had never had any
inhibitor in it and was a good ten years old when the holes appeared,
in a couple of rads. I soldered little bits of copper over them,
drained the system and refilled with inhibitor no more holes
appeared.

--
Cheers
Dave.

Good idea Dave: I haven't been very lucky with getting solder to stick to
old iron in the past but it may be worth a try. On the other hand it might
make the hole bigger...

My technique with the earlier holes was just to drill and tap them and glue
in a small screw, but in the current example there isn't room for this.

Still nobody seems to have much to say about the leak stopping and
inhibiting chemicals. Shame as they are quite expensive to just 'suck it
and see'.

Cheers
S