If your radiator feels cold at the top but warm at the bottom, it’s likely due to trapped air preventing hot water from circulating properly. Fortunately, this is a common issue you can easily fix by bleeding your radiator.
How to Bleed a Radiator: Step-by-Step Guide
- Turn off your heating and allow the system to cool completely. Radiator water can be extremely hot, so this step is crucial for safety.
- Find the bleed valve usually located at the top of the radiator. Place a towel or a container underneath to catch any drips.
- Insert a radiator key into the valve and turn it anti-clockwise about a quarter turn. You’ll hear a hissing sound as the trapped air escapes.
- Let all the air out. Once water starts to flow steadily, close the valve by turning it clockwise, but don’t overtighten.
- Switch the heating back on. Your radiator should now heat evenly from top to bottom.
If on the other hand your radiator is warm at the top but cold at the bottom, or has cold patches, it may be due to a build-up of sludge inside. This isn’t something you can fix yourself; instead, contact a qualified heating engineer who have the tools and expertise to flush the system and restore proper function.
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