How do you bleed a radiator line?

Bleeding a radiator line involves removing trapped air to improve heating efficiency; here's how you do it.

Steps to Bleed a Radiator

Here's a step-by-step guide on how to bleed a radiator line, incorporating information from the provided YouTube video transcript:

1. Gather Your Materials: You'll need a radiator key (or a small screwdriver, depending on the valve type) and a cloth or small container to catch any water.

2. Locate the Bleed Valve: This is usually a small valve located at the top of one end of the radiator.

3. Prepare to Catch Water: Hold the cloth directly beneath the bleed valve to protect from any water that may escape.

4. Open the Valve: Insert the radiator key into the bleed valve. According to the video transcript, the valve may be "generally quite tight", so apply gentle but firm pressure to turn the key slowly counterclockwise. Only a small turn is needed.

5. Listen for Air: At first, you should hear a hissing sound as trapped air escapes.

6. Watch for Water: Once water starts to trickle out instead of air, close the bleed valve by turning the key clockwise. Do not overtighten.

7. Repeat if Necessary: If the radiator still isn't heating properly, repeat the process. You may need to check the pressure of your heating system and top it up if it has dropped too low.