Bleeding a radiator is easy to do, but it must be done correctly. When a radiator is hot at the bottom but cold at the top, it needs bleeding.
First, you should switch off the central heating to stop more air from being sucked into the system. You also need a receptacle such as a bowl to place under the valve to collect any liquid that may be released.
If you do not have a radiator key, buy one at your local DIY shop. The radiator has a valve on top with a tiny square shaft in the centre. Using the radiator key turn the shaft carefully until you hear that air is being released.
If you place your hand on the top of the radiator as the air is being released, you will feel it start to heat up. As soon as water starts to leak out of the radiator, use the key to tighten the shaft in the valve. If you have a sealed system, be sure to check the pressure after bleeding, and top up the pressure if needed.
If the square shaft in the valve has a slot cut into it, it will usually be possible to bleed your radiator with a small screwdriver instead of a key.
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