VW Polo Mk4 2001-2009 Radiator Coolant Expansion Header Tank With Sensor Vehicle Model_Idea E Number (2113308107

E Number (2113308107

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E Number (51510TA0A03

31126855742

7H5411317A

VW Polo Mk4 2001-2009 Radiator Coolant Expansion Header Tank With Sensor Vehicle Model_Idea E Number (2113308107One of the lesser known parts on your VW Polo 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