BMW 5 Series F10, F11 2009-2017 Radiator Coolant Expansion Header Tank Vehicle Model_X4 One common sign that a

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BMW 5 Series F10, F11 2009-2017 Radiator Coolant Expansion Header Tank Vehicle Model_X4 One common sign that aOne of the lesser known parts on your BMW 5 Series is the coolant expansion tank. This component is responsible for catching and storing coolant overspill from the vehicle's radiator. The coolant in your vehicle is designed to prevent the engine from overheating. As it reaches its optimal operating temperature, it expands and can overflow. The expansion reservoir collects this excess fluid and stores it safely instead of letting it spill onto the