An engine's thermostat regulates the temperature of the engine by controlling coolant flow, its job is to block the flow of coolant to the radiator until the engine has warmed up.
Symptoms of 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 vehicle.

Compatible with Nissan 3.5L 4.0L V6 Vehicles:
2003-2006 350Z 3.5L
2005-2019 Frontier
2012-2021 NV1500
2012-2021 NV2500
2012-2021 NV3500
2005-2012 Pathfinder
2005-2015 Xterra

Compatible with Infiniti 3.5L V6 Vehicles:
2004 FX35
2003-2007 G35
2006-2008 M35

Replaces Part #: 21200-31U1B, 2120031U1B thermostat with gasket.

NOTE: This is NOT a genuine part, it's a aftermarket replacement part manufactured by Allmotorparts.

NOTE: To ensure accurate fitment, please confirm your vehicle information in the above compatibility section and the description.