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.. Fully open all radiator thermostats and run the heating at full temperature for 10 to 15 minutes with all radiators on. Turn the circulation pump off and wait until radiators are cool (around half an hour to an hour) Bleed the radiator nearest the boiler using a bleed key or screwdriver until water comes out.

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There are several reasons why your top radiator hose may be hot and the bottom cold. The most common reason is a leaking head gasket, but there are other potential causes as well. Stuck open or closed radiator valves, a faulty thermostat, or a water pump that is not working properly can all cause this problem.. In this video, i will show you 4 easy ways to fix a cold radiator. If you've got one cold radiator but the rest are hot then don't panic because i will show.