Never used, directly replaces the old one and easy installation.. Fitment: for Lexus GS300 2006, for Lexus GS350 2007-2011, for Lexus GS350 2013-2015, for Lexus IS250 2006-2015, for Lexus IS300 2016-2018, for Lexus IS350 2006-2018, for Lexus RC300 2016-2018, for Lexus RC350 2015-2018. OE Number: 143-0879, 1430879, 49408, 1603131020. 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.
