Engine Thermostat Assembly Replaces 90916-A3003 90916A3003 90916-03129 Compatible with Toyota Avalon Camry Celica Corolla Highlander Matrix M

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 Toyota Vehicles: 1995-2004 Avalon 1994-2006 Camry 2010-2017 Camry 2000-2005 Celica 2000-2008 Corolla 2014-2018 Corolla 2001-2018 Highlander 2003-2008 Matrix 2000-2005 MR2 Spyder 2001-2005 RAV4 2009-2018 RAV4 1998-2006 Sienna 2011-2012 Sienna 1999-2008 Solara 2009-2015 Venza Replaces Part #: 90916-A3003, 90916A3003, 90916-03129, 9091603129 Thermostat. NOTE: To ensure accurate fitment, please confirm your vehicle information in the above compatibility section and the description.