This is happening even after the heating system has been on for a while. I'm not entirely clear if you are saying uneven temperature distribution is normal or not? I was under the impression it wasn't normal, but I'm happy to be corrected. Thanks
If your heating system, is working flat out, and there is unrestricted flow, through the radiator, then the bottom may get to a similar temperature. However, properly balanced, or once to temperature, they will get hotter at the top.
Having said that, completely cold at the bottom, might mean there is no flow at the bottom, which would suggest it is choked up with debris.
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