Rose just won't bloom
Hi, Well it would help to know what variety of climber you have. First, climbers, like other roses, require a lot of sun to bloom so if this climber is shaded by overhanging trees or buildings it might not bloom. Also, it this plant is very old, it could be that the original plant died some time ago and you are tending shoots from the root graft (most modern climbing roses are actually grafts with a flowering variety fused to a root stock from a wild, very hardy wild type). So, if the top died some time ago, it's possible that the canes you are seeing are from the root stock which will not ever bloom. See if you can see a swollen, ball-like area at the base of the plant (that's the graft). If the roots are coming from underneath the graft it could be that the blooming part of your rose is long gone. Of course, there are climbers that are not grafted so this might not be the problem at all. Without knowing what variety you have, I'm just fishing here.