Hi, i am wondering if I can get some advice please? I have moved into a new house a few months back. We had a single panel radiator which wasn't giving much heat so i decided to change it to a type 22 radiator. I bought a new 1600x500 kudox radiator with new trv and lockshield but the new radiator is cold from bottom and hot from top. I have tried bleeding it and balancing it but no luck. I turned all the radiators off except the new one and turned the heating on. The boiler made loud grining noise and I could also hear lot of noise coming out the radiator. But the bottom of radiator did get a bit warm. So about 20 mins later when i opened the bathroom towel rail, the boiler started behaving normally. So now i am very much confused and thinking whether the new radiator faulty? Or there is a bloackage in the pipe for that specific radiator? All other radiators in the house are burning hot from top till bottom. What can I do now? Any advice please is welcome. Thanks Oh and the trv and ther other valve is fully open.