The pipe between two radiators has become air locked?

The pipe between two radiators has become air locked. There is water in both radiators but the second radiator will not heat.
Any suggestions on what I can do to remove the airlock?
Colm, December 2004


done
IF BOTH RADS ARE FULL IT IS MORE TO DO WITH BALANCING ON THE SYSTEM TRY TURNING THE LOCK SHIELD VALVES DOWN

STEVE@BH HEATING, January 2005