Added a new radiator to extension but its not getting any flow.

In fairness, I’ve just fitted this radiator just before we started using the central heating for the winter so I haven’t actually checked it recently but it has always worked yes and all the other radiators are working fine in the house I’ve definitely come off the feed and return. I have concentrated A lot on bleeding the new radiator a few times but I haven’t spent a lot of time bleeding the old radiator…. I’m wondering if the old radiator was drained more than I thought when I fitted the new rad and that one is air locked.
 
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I’ve finally got to the bottom of this thanks for everyone that replied… basically the two manifolds as you look at the downstairs setup. The bottom manifold (return) has hand knobs to adjust the flow.. all of these were fully open so I’ve been thinking that was that… but the top manifold doesn’t have anything obvious on it to adjust. But of course it does there are allen keys set in on the top of this manifold, when the guy fitted the system he’s obviously balanced the system and the old radiator is the smallest and closest to the manifold so it was turned right down! . Thanks again for the help.
 

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