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Mercedes S-Class A217 2014-2020 Radiator Coolant Expansion Header Tank Vehicle Model_Eclipse All Opel Vauxhall tie rodOne of the lesser known parts on your Mercedes Benz S Class 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