1. Park your car on a level surface. This will help to ensure that the coolant is evenly distributed throughout the system.
2. Turn off the engine and allow it to cool down. This will help to prevent any further air from entering the system.
3. Locate the bleeder screw on the radiator or coolant reservoir. This is usually a small screw with a slot or Phillips head.
4. Place a pan or bucket under the bleeder screw to catch any coolant that may come out.
5. Loosen the bleeder screw. This will allow any trapped air to escape from the system.
6. Allow the coolant to flow out of the bleeder screw until a steady stream is coming out. This means that all of the air has been removed from the system.
7. Tighten the bleeder screw.
8. Start the engine and let it run for a few minutes. This will help to circulate the coolant throughout the system and ensure that there are no more air pockets.
9. Check the coolant level in the radiator or coolant reservoir and top it up if necessary.
If you continue to experience problems with air locks in your Peugeot 405's heating system, you may need to take it to a mechanic for further diagnosis and repair.
