Cold Radiators 2 Up stairs and 2 down any help


Hi,
Can anyone help.
I have two radiators upstairs and two down stairs that are cold.
These started off with one then moved around the house to another then downstairs. Over a period of 12 month it has gone from one cold to four now cold.
Tried Bleeding every one and closing the termostats on all hot ones but no success,
any ideas what this could be. Is suspect it may be the pump but not sure..
How much are these to replace.. ?
cheers
P
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snipped-for-privacy@hotmail.com wrote:

Check the pressure on your boiler. The valves that allow fresh water in the system are prone to failure.
Try bleeding again and again. An air pocket can be tricky to get rid of. Usually helps to bleed the furthest from the boiler radiators first and work back to boiler.
Some say to bleed with the pump off others with the pump on. I turn the pump on to get things flowing then shut it off to bleed, then do it again. Lather, rinse, repeat...
Do you have well water or galvanized pipe? Sediment could be blocking your flow somewhere.
Pumps _usually_ work or they don't, unlikely it is only working a little bit. Not hard to change but may require draining the entire system. Just bought one a few weeks ago for around $80, YMMV.
If you have the _thermostat_ valves at each radiator you should turn them through their entire range a few times then turn to full hot or bypass when bleeding. Then adjust them to control the radiators after you get heat at all the radiators.
Good luck.
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