BMW 3 Series E90, E91 2004-2013 Radiator Coolant Expansion Header Tank & Sensor Vehicle Model_Daily So if you're looking for

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BMW 3 Series E90, E91 2004-2013 Radiator Coolant Expansion Header Tank & Sensor Vehicle Model_Daily So if you're looking forOne of the lesser known parts on your BMW 3 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