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Bleed Air Bubbles from the Cooling System

Model: BMW Serie 3 E91, E90, E92 - Years 2005-2013
Part: Pump

During any maintenance on the engine's cooling system, it is absolutely important to ensure that no air bubbles form in the circuit. The presence of air bubbles can cause negative phenomena that may compromise the lifespan and efficiency of the system itself (corrosive processes due to oxygen; cavitation phenomena in the circulation pumps; noise generated by the passage of air in the piping).
Once maintenance is complete, you will need to perform a sort of bleeding to allow air to escape from the system: one method is to leave the radiator reservoir cap open and check the regularity of the water flow from the return hose.

Updated on 10 February 2026 by ScegliAuto

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