Never used, directly replaces the old one and easy installation.. Fitment: for Hyundai Sonata 2.4L 2359CC L4 DOHC 2008-2010 , for Kia Optima 2.4L 2359CC L4 DOHC 2009-2010, for Kia Rondo 2.4L 2359CC L4 DOHC 2008-2010. OE Number: 256002G600. Good Replacement: The engine's thermostat regulates the temperature of the engine by controlling coolant flow. A bad or failing thermostat: high temperature reading and engine overheating, low temperature reading and underheated engine, temperature changing erratically, coolant leaks around thermostat housing or under the vehicle. How to fine thermostat: You can find your car's thermostat by starting at the upper radiator hose and following it to where it enters the top of the engine.. Package Included: 1 x Thermostat Housing Assembly.
