Initially, turn your central heating system on to spring your hot water radiators into life. Once they’ve heated up, you can decide which, if any, require bleeding. Check all hot water radiators individually to see if all parts are warming up to the full extent. Take care, of course, not to scald yourself! If you do identify any cool areas, it could be a sign that gas or air is trapped, and the radiator needs to be bled.
To actually begin bleeding your radiator, first switch off your central heating. This step will ensure you don’t burn yourself or flood your floor. Preferably, you’ll have a radiator key for each component, or be able to find one at a local hardware store if not. Alternatively, you may be able to make do with a flat-blade screwdriver to bleed your radiators.
One side of the radiator will feature a valve – if you have a radiator key then it can be attached to the square section in the center. If you’re using a screwdriver, you can simply apply the end of it into the groove. From there, use a cloth to gain a better grip of your key or screwdriver, and turn it in an anti-clockwise direction. A hissing sound will emit if gas is emerging. Lay a towel down beneath your hot water radiator to catch any potential drips. Once the gas has gone, liquid will emerge and the valve will need to be quickly closed. More modern valves, which tend to work with a screwdriver, will discharge liquid in a jet-like stream as opposed to a dribble.