Plumbing Radiator left or right or does it matter?

I had an extension built about two years ago. The plumber put the heating flow pipe to the left hand side of both radiators. There are normal myson rad valves on each side. If I have both valves open why does the rad not heat up fully. I have tried two different radiators albeit old radiaotrs?
thanks lads
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Probably air in the radiator.
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Assuming the rest of the system works, i.e. all other radiators heat up, here is a non exhaustive list of suggestions:
1. System badly unbalanced. 2. Knackered radiator valve doesn't really open. 3. Pipework clogged. 4. Pipework capped off and not connected to the system. 5. Pipework spur has been closed off by isolating valves elsewhere. 6. Radiator is on separate zone that isn't powered. 7. Radiator seriously bunged up. 8. Radiator not bled. 9. Radiator above or close to level of feed/expansion tank having been installed by brain dead loft conversion "specialist".
Did this radiator ever work?
Christian.
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Christian
Thanks for that. I did a fault finding using your guide and still no luck. It was bled as far as I thought. One of my nosey friends came round and I was telling him about the rad. He opened the bled valve fully (no water came out)? and stuck a pin in. Whisssh. Lots of air came out. It must have been a piece of dirt stopping the air from getting out.
Anyhow thanks again.
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At least now you know that you have to wait for the water to come out when bleeding!
Christian.
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