To bleed a radiator air vent, you need to release trapped air from the radiator to improve its heating efficiency. Here's how:
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Locate the air vent: Look for a small, usually square pin at the top edge of the radiator, often on one side. This is the release valve (or bleed valve).
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Gather your tools: You'll need a radiator bleed key (a small, specialized wrench) or a flat-head screwdriver that fits the valve. You'll also need a cloth or small container to catch any water that may escape.
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Insert the key or screwdriver: Fit the radiator bleed key or screwdriver into the valve.
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Open the valve: Slowly turn the key or screwdriver counterclockwise. You should hear a hissing sound as air escapes.
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Close the valve: Once water starts to trickle out (instead of air), immediately close the valve by turning the key or screwdriver clockwise. Don't overtighten.
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Check the pressure: After bleeding all your radiators, check the pressure on your boiler. If it's low, you may need to top it up according to the boiler manufacturer's instructions.
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Repeat if necessary: If the radiator isn't heating evenly, repeat the process.
