Yup running all morning with both pins fully open and still cold on one side.Fair enough, however was the TRV crown always on the right hand side? Those kind of rads often have baffles but that is often a flow/return issue. TRVs seem to be less concerned about the direction of flow these days.
I am not a plumber, but.. yeah, when the pin is fully up, the valve should be open. Have you run the rad with both pins fully up?
The following might be worth while watching
Best of luck
When I was bleeding it I stopped once a solid stream of water was coming out. Is it worth trying to bleed it again for 30 seconds or a minute or so to see if some trapped air is just struggling to get out? Can't see why that would be the case but worth a shot?