my radiater is warm at top but middle and bottom will not heat?

did you bleed it? there is a little nut at the top right hand side of the radiator which you loosen very slowly until you hear it hissing air (you use a thing called an allen key available in any hardware store ). When the air stops coming out and water starts then tighten the nut again. This should fix the problem

DIY mom
September 2012