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12 guidesA radiator that is hot at the bottom and cold at the top has air trapped in it, and bleeding takes about five minutes per radiator with a key that costs a few dollars. But first you have to know which kind of radiator you own: hot-water radiators get bled, steam radiators never do. This guide covers the one-minute test that tells them apart, the full bleeding sequence, and what to do instead on a steam system.