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A radiator that is warm at the bottom and cold at the top may have trapped air, affecting heating efficiency. This issue often arises after a period of inactivity in the heating system. Proper bleeding of the radiator can resolve the problem, but in homes with their own heating systems, pressure checks are also necessary post-bleeding. If multiple radiators are cold, a thorough inspection of the entire heating circuit may be required. In cases where the radiator remains cold despite bleeding, checking valves and potential blockages is essential. If issues persist, a technical inspection is recommended to identify leaks or pressure loss.