Bleeding a Radiator

The easiest way to tell if a radiator needs bleeding is by touch. A radiator that feels cold at the top, whilst warm at the bottom has air in it and must be bled. All radiators have a valve at the top with a small square shaft in the middle. Hold a cup or jar under the valve.

Using a radiator key, which can be bought cheaply from any DIY store, you need to turn the square shaft slowly until air starts to seep out. If you place one hand on the radiator you will be able to feel the heat rising up the radiator. As soon as water starts to leak out of the radiator, use a key to tighten the valve. Keep the key in the valve at all times, and do not remove the shaft completely or black water will spill out of the hole.

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