• Fitment: for INFINITI QX4 2001-2003, INFINITI G35 2003-2007, INFINITI FX35 2003-2008, Nissan 350Z 2003-2007, Nissan Pathfinder 2001-2004. • OE Number: 21200-4W01B/212004W01B. • Feature: New and unused, directly replaces the previous one and is easy to install. • Great replacement: the engine thermostat regulates the engine temperature by controlling the coolant flow. • A faulty thermostat can cause: high temperature reading and engine overheating, low temperature reading and engine underheating, erratic temperature changes, coolant leaks around the thermostat housing or under the vehicle. • How to adjust the 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 includes: 1 x Thermostat housing assembly.