Fits: 2001–2021 Chevrolet Silverado 2500 HD 2001–2006 Chevrolet Silverado 3500 2006–2016 Chevrolet Express 2500 2006–2016 Chevrolet Express 3500 2007 Chevrolet Silverado 2500 HD Classic 2007 Chevrolet Silverado 3500 Classic 2007–2021 Chevrolet Silverado 3500 HD 2009–2012 Chevrolet Express 4500 2001–2021 GMC Sierra 2500 HD 2001–2006 GMC Sierra 3500 2006–2016 GMC Savana 2500 2006–2016 GMC Savana 3500 2007 GMC Sierra 2500 HD Classic 2007 GMC Sierra 3500 Classic 2007–2021 GMC Sierra 3500 HD 2009–2012 GMC Savana 4500 MishimotoMMTS-CHV-01DLThermostatsThe Mishimoto Chevrolet Duramax low temperature thermostats activate at a lower temperature than the OEM thermostats, making them the perfect solution for Duramax owners who live in warmer climates, or use their trucks under heavy load or strenuous driving conditions.Activating at a lower temperature means coolant will begin flowing through the system and allow for cooler temperatures.Mishimoto thermostats are effective in noticeably lowering engine coolant temperatures. These thermostats are built with high-quality wax and are shipped with new rubber gaskets (where applicable) for a good, leak-free seal. They are then digitally calibrated for precise operation. Mishimoto thermostats open up at a slightly lower temperature than OEM or standard thermostats once your engine is fully warmed up. This allows the coolant to flow through the engine sooner, thus reducing and maintaining cooler engine temperatures. Whether you have a daily driver or a modified and upgraded turbo, Mishimoto thermostats will maintain optimal temperatures to efficiently cool your application.