How do you bleed a radiator?


Quick Answer

To bleed a radiator, fill the radiator and the coolant reservoir with a mixture of water and antifreeze, and run the engine with the radiator cap off until the air in the radiator escapes. Finally, refill the radiator and the coolant reservoir to the top, and replace the radiator cap.

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Full Answer

  1. Mix the ingredients

    Pour one part of water into a container, add one part of an antifreeze, and then mix them. Remove the radiator cap, and pour the mixture into the radiator up to the rim. Repeat the process for the coolant or overflow reservoir.

  2. Run the engine

    Without replacing the radiator cap, ignite the engine, and let the engine run until the coolant level drops and air bubbles come out of the radiator. While the engine runs, examine the temperature gauge to ensure that the temperature drops to the normal range so the radiator feeds the coolant evenly. This ensures efficient functioning of the engine.

  3. Refill the radiator and coolant reservoir

    Fill the radiator to the top, and also fill the coolant reservoir. Replace the radiator cap to prevent the entry of air into the system, and lower the bonnet. Finally, test the radiator to ensure that the engine does not overheat.

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