Turn off heating system. Turn off the radiator valves. Drain the radiator. Disconnect and remove from the wall. Flush the radiator with a hose. Re-install the radiator. 1. Turn off heating system. Before you can start working on your radiator you'll first need to switch off your heating system.. First picture is the kitchen radiator - nice and hot all over. The next picture is the next radiator in the system which is in my new extension. The inlet pipe is hot and the radiator is hot up that same side and along the top, but down the radiator towards the floor and towards the return pipe the radiator gets colder.

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Place something under the radiator to catch any water that runs out. 'Turn off your heat so that water isn't being pumped through the radiator as you bleed it. 'Slowly open the bleed valve. Trapped air will escape with a hissing sound. When the hissing stops, water will come out of the valve.. 4. Thermostat issues. Another reason you can be left wondering why is my radiator cold is a faulty thermostat can cause your entire heating system to not heat up properly, or even not heat up at all. The thermostat is there to detect the temperature around your home so, if you notice that your entire home is cold, it could be a sign of a faulty.