Cleaning out the V12 air bleed screw on on XJ6 Jaguars

  • Gary
  • XJ6

Cleaning the V12 Air Bleed Screw on Jaguar XJ6 Models: A DIY Guide

If you’re the proud owner of a Jaguar XJ6 with the legendary V12 engine, you probably know that proper cooling system maintenance is critical to keep your cat running smoothly. One often-overlooked component is the air bleed tube assembly on top of the radiator. This small but crucial part helps vent trapped air from the cooling system.

The air bleed system relies on a hollow screw located at the top of the radiator to let air escape. Over time, this screw can become clogged with debris or buildup, preventing air from escaping properly. If left unchecked, it could contribute to overheating—a known nemesis of V12 Jaguars.

Here’s a quick DIY guide to clean the air bleed screw:

What You’ll Need:

  • A flathead screwdriver (or the appropriate tool for your radiator’s screw)
  • A small wire brush or pipe cleaner
  • Compressed air (optional but helpful)
  • A container to catch any coolant spills
  • Clean rags

Step-by-Step Instructions:

1. Safety First:
Ensure the engine is cool before working on the cooling system. Hot coolant can cause serious burns.

2. Locate the Air Bleed Screw:
Open the bonnet and find the air bleed screw on the top of the radiator. It’s part of the air bleed tube assembly that allows air to vent from the cooling system.

3. Remove the Screw:
Use your flathead screwdriver (or the appropriate tool) to carefully unscrew the air bleed screw. Have your container ready to catch any coolant that might leak out.

4. Inspect and Clean the Screw:
Examine the hollow screw for debris or gunk. Use the wire brush or pipe cleaner to remove any buildup inside the screw. If you have compressed air, use it to blow out any remaining debris.

5. Reinstall the Screw:
Once the screw is clean and free of obstructions, carefully reinstall it into the radiator. Make sure it’s snug but don’t overtighten it.

6. Check Coolant Levels:
After reinstalling the screw, check your coolant levels and top off as needed. Trapped air may have caused the level to drop slightly.

7. Test the System:
Start the engine and let it reach operating temperature. Keep an eye on the temperature gauge to ensure the cooling system is functioning properly.

By regularly cleaning the air bleed screw, you can help your XJ6’s cooling system stay in top shape and avoid costly overheating issues. This small maintenance task can make a big difference in your Jaguar’s performance and longevity.

Happy motoring!