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If a radiator is hot at the top but cold at the bottom, it may indicate issues like sediment buildup or poor water circulation. Before calling a plumber, check for simple solutions such as ensuring valves are open and the thermostat is set correctly. Sediment can block water flow, especially in older systems. If the radiator is not heating evenly, it may require cleaning or adjustments. Additionally, a blocked or malfunctioning valve can restrict hot water entry. If multiple radiators are affected or if the problem persists, professional help may be necessary. Normal temperature differences can occur, but if the bottom remains cold, further investigation is warranted.