Tim Mitchell wrote in message ...
In article , JJC001
writes
I drained my central heating system to remove s couple of pipes that
used to feed a radiator that has not been on the wall since moving
into the house. The pipes were t'd in so I simply removed the T joints
and reconnected the pipes with some straight connectors. I then
refilled the system by turning on the water to the expansion tank in
the loft and bled as many of radiators as possible. Everything seemed
to be ok but:

1: The radiator in one of the bedrooms is warm at the bottom but not
at the top. I cannot find a bleed valve on it anywhere. Not at the
sides or the along the top at the back. There is a circular lump in
what I would consider to be a normal position but there is no valve
attached. Is this usual and if not how can I bleed it?
The lump is a little plastic cap, the bleed screw is recessed in a hole.

Thanks all for the advice, a few turning off/on of various radiators
and bleeding them a few more times has resulted in some success. I can
confirm that the lump is a little plastic cap but alas still no bleed
valve. Perhaps the people who installed the radiator got lazy and
didn't put a bleed valve where the plastic plug is?