It sounds as if all your rads need balancing......
Are the ones that normally heat up very hot, especially the ones closest to the boiler (these maybe the upstairs loop on a drop system)?
If so, these rads are robbing the heat from the rest of the system, as in letting too much hot water flow into them, then sending it back to the boiler......
The lock shield side of these rads need to be adjusted to restrict the flow they take to allow more of the hot flow to reach the further rads.....
T
April 2008
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