Turn off the heating system and allow the water in the pipes to cool.
Turn off the valves at each end of the radiator. Turn off the control valve by hand. The second valve will have a plastic cap. Pull it off and turn the valve clockwise using a crescent wrench.Count the turns required to turn valve off. When the radiator is reinstalled, it can be adjusted to the same setting.
Use the bleed key to open the air bleed valve at or near the top of the radiator. A small amount of water may discharge when this valve is opened, so have towels or rags handy to keep water off the floor. If water continues to flow from the air bleed valve, the control valves did not close properly. Try to re-tighten these valves. If water continues to flow, the entire system will require draining. Leave the air bleed valve open when water stops flowing.
Remove the nuts where the water pipes are attached to the valves by holding one nut in place with water pump pliers and turning the second nut with another pair of pliers. Some water will drain when these nuts are loosened; use a tray or pan to catch any drainage. If pan becomes full, tighten the nut, empty the pan and then continue until no water is flowing. Close the bleed valve.
Pry the incoming water pipes slightly away from the nuts. Lift the radiator out of its brackets. There will still be water in the bottom of the radiator. Tip the radiator over the pan to drain out the water and sludge.
Things You Will Need
- Crescent wrench
- Radiator bleed key
- Water pump pliers (two)
- Tray or pan
- Store the radiator upside down until you are ready to reinstall it to prevent any water or sludge from dripping on the floor.