Hi ive got 2 radiators in an upstairs bedroom wich are on the the end of the pipel run upstairs. All radiatorsin the house are hot, I bled the rads and found no air in them. I then closed the rad valves and removed the rads wich both had alot of sludge in. I then put a hose on the end of each valve and opend untill water ran clear and hot. When I put the rads back on they heated up but only for about 5 minutes and now they are cold again. Any ideas on what could be causing the problem.
Many thanks J
Many thanks J