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BMW X5 E53 1999-2006 Radiator Coolant Expansion Header Tank Mounting Vehicle Model_Magentis 1K0 407 151BB S1) inOne of the lesser known parts on your BMW X5 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