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BMW X3 E83 2003-2010 Radiator Coolant Expansion Header Tank Vehicle Model_X5 F15 are an important safety andOne of the lesser known parts on your BMW X3 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 road. How