"AK" wrote in message ...
I have been trying to bleed my radiators tonight and the top floor (a
3 story house) is just about as full of air as it could be. I have
bled loads out but after running downstairs 3 or 4 times to top up
the pressure in the system I have given up for the night. It occurs
to me that I am probably getting this because I don't have enough (if
any) treatment in the system. the house is 18 months old and I would
bet the developer didn't put anything in....................the water
is nice and clear what is coming out.


What pressure do you run the system at? It would seem to me that the
rpessure reading at the bottom of the hosue would be mroe than the one
at the top so maybe air is being drawn in through your leaky bleed
vave?