Engine Thermostat with Gasket Replace 21200AA072 Compatible with Subaru - 1998-2013 Forester 1993-2014 Impreza 2002-2014 Impreza WRX 2004-2014 Imp

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. NOTE: If the thermostat has a jiggle pin, check valve, or other feature to assist in bleeding air from the system in a vertical installation, the jiggle pin should be located at the north or 12 o'clock location. Compatible with Subaru Vehicles: 2003-2006 Baja 1998-2013 Forester 1993-2014 Impreza 2002-2014 Impreza WRX 2004-2014 Impreza WRX STI 1990-2004, 2009, 2015 Legacy 2000-2005, 2015 Outback 1992-1997 SVX 2015-2016 WRX STI Replaces Part #: 21236AA010 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.