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How to Bleed a Radiator?
Air trapped in your radiator will prevent the radiator heating up properly and if not resolved will eventually cause corrosion. If your radiator feels cooler at the top than at the bottom more than likely a pocket of air has found its way there and is restricting full circulation of the water. Getting the air out or as it is called "bleeding" is a simple task that you can do yourself! Radiators have a bleed valve at the top corners.
Use a valve key to turn the shank anticlockwise.
A slight turn is all you will need and have a small container or an old towel ready to collect any water which may escape.
Do not try to open the valve too much as more water than air will escape. You should hear a hissing sound as the air escapes.
When the hissing stops close the valve tightly.