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Bleeding radiators
It's a fact of life that air will eventually get into the central heating system and get trapped at the highest point. One of the favourite hiding places for air is the top of a radiators, which is exactly where you should find the 'bleed valve' to let it out.
How do you know if a radiator needs bleeding? One common sign is if the top of the radiator is colder at the top than at the bottom. And often the radiator worst affected will be the one that is at the highest point in the central heating system.
The affected radiator may also let you know that it has air inside it by making strange sounds, as hot water is pumped around it.
And if there is air inside, you will have this confirmed once you undo the 'bleed valve' as it escapes, to be followed shortly by water, the signal to say a job well done.
A radiator that has air in it is not working efficiently, so it pays to keep an eye open for this problem.
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