How to repair a radiator

Here are three methods to repair your failing radiator. You can either stop it from leaking, replace the valve, or bleed it.

Level of difficulty

Level 2: Intermediate

What you need

  • Pliers
  • Teflon ® tape
  • Silicone sealant
  • Bleed key
  • Adjustable spanner

The steps to follow

I. To repair leaking radiators:

  1. Turn off valve on one side of the radiator.
  2. Turn off the lock-shield valve.
  3. Using pliers, tighten the valve spindle.
  4. If leaking still persists, wrap the cap nut with Teflon® tape.
  5. You can also coat sealant or wrap Teflon &regi; tape to the olive and tighten the cap nut.

II. To bleed a radiator:
Note:
If you plan to bleed the radiator, it's best done at the start of autumn in preparation for the colder months.

  1. Turn the system and the thermostats to their maximum temperature.
  2. Open the valve with a bleed key to release the air.
  3. Tighten the valve when water starts to flow.
  4. Return the thermostats to normal.

III. To repair the valve:

  1. Unscrew the valve with an adjustable spanner.
  2. Remove the valve adapter.
  3. Clean the threads
  4. Wrap the threads of the new adapter with Teflon ® tape.
  5. Attach it to the end of the radiator.
  6. Slide the valve cap-nut over the end of the pipe and fit the valve.
  7. Replace with the new valve and tighten the cap nuts holding the valve to the adapter and the water pipe.
  8. Refill the radiator with water.
  9. You'll need to bleed the radiator before usage. Refer to the instructions above on how to bleed your radiator.
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