Bleeding Your Radiators

There is little worse than coming home on a freezing cold night only to find that, when you switch on your central heating, your radiators will not warm up. Far from basking in their warmth you now have to figure out why this is happening and then how to rectify it. Fortunately, the issue of cold radiators is a common one and there a several ways in which you can fix it on your own.
You may have to bleed the radiator. This is not a hard process and can be completed in a few simple steps. Essentially, bleeding the radiator means removing any air that has found itself at the top of the radiator itself and is preventing heat from getting through. This is a process that should be used, on average, once or twice a year but you may have to do it more often dependent on your radiator style.
What you need to do first is check that both valves for the radiator are open, Indeed, if one of these are closed then this could very well be the answer to your cold radiator problem and no further action may be necessary other than opening the valve. Next you need to get the vent key and attach it firmly to the air vent found on the top of the radiator and then unscrew the air vent. It is useful to have a dry cloth or towel nearby in case any drips of water fall out.
Once you have done this you should hear a sort of hissing sound and this is the surplus air escaping from the radiator and, if you have done the process correctly, after a few seconds this should turn into a burst or squirt of water. One this happens simply retighten the air vent and the heat should start coming through.