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 under heated 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 Buick Vehicles: 2007 Rainier

Compatible with Cadillac Vehicles:
2009-2015 CTS
2007-2014, 2021 Escalade, ESV
2007-2013 Escalade EXT

Compatible with Chevy Vehicles:
2007-2013 Avalanche
2010-2015 Camaro
2011-2017 Caprice
2009-2012 Colorado
2009-2013 Corvette
2007-2014 Express 1500
2007-2021 Express 2500, 3500
2012-2019 Express 4500
2007-2013, 2019-2021 Silverado 1500
2007-2021 Silverado 2500 HD, 3500 HD
2014-2017 SS
2021 Suburban
2007-2014 Suburban 1500
2007-2013 Suburban 2500
2016-2019 Suburban 3500 HD
2007-2014, 2021 Tahoe
2007-2009 Trailblazer

Compatible with GMC Vehicles:
2009-2012 Canyon
2007-2009 Envoy
2007-2014 Savana 1500
2007-2021 Savana 2500, 3500
2013-2017, 2019 Savana 4500
2007-2013, 2019-2021 Sierra 1500
2007-2021 Sierra 2500 HD, 3500 HD
2007-2014, 2021 Yukon, XL 1500
2021 Yukon XL
2007-2014 Yukon XL 1500
2007-2013 Yukon XL 2500

Compatible with Hummer Vehicles:
2007-2009 H2
2008-2010 H3
2009-2010 H3T

Compatible with Pontiac Vehicles: 2009 G8

Compatible with Saab Vehicles: 2007-2009 9-7x

Replaces Part #: 131-160, 131160, 89018168 thermostat.