Gates 34198S Engine Coolant Thermostat

Gates Premium Thermostat 34198S Overview

The Gates Premium Thermostat 34198S is an engine coolant thermostat built for stable temperature control in a wide range of Chevrolet, GMC, Cadillac, Hummer, Saab, and Buick applications. It uses stainless steel and copper construction with an O-ring seal and jiggle pin weep hole for dependable coolant flow management.

Gates Premium Thermostat line focuses on upgraded corrosion resistance and spring performance for more consistent opening behavior under normal operating conditions. This 187-degree thermostat is a direct-fit option for many GM trucks, SUVs, and performance cars, including Chevrolet Silverado 1500, GMC Sierra 2500 HD, and Cadillac CTS applications.

Key Features

• Part number 34198S
• Premium thermostat design with bottom by-pass configuration
• Stainless steel and copper construction for corrosion resistance
• 187-degree start-to-open temperature
• O-ring seal type with seal included
• Jiggle pin weep hole for air bleeding during service
• Heavy-gauge construction and upgraded spring for temperature stability

Detailed Product Description

This Gates Premium Thermostat 34198S is engineered for engine coolant regulation in vehicles that require a 187-degree OE-temperature thermostat. The stainless steel body and copper components help resist corrosion in demanding cooling systems, while the upgraded spring supports consistent operation as coolant temperature changes. The bottom by-pass design and O-ring sealing style make it a practical replacement for service work on GM cooling systems.

Compatible With 2007-2018 Chevrolet Express 2500, 2007-2018 Chevrolet Express 3500, 2007-2018 Chevrolet Silverado 2500 HD, 2007-2018 Chevrolet Silverado 3500 HD, 2007-2018 GMC Savana 2500, 2007-2018 GMC Savana 3500, 2016-2018 GMC Sierra 2500 HD, and 2016-2018 GMC Sierra 3500 HD. It also fits many passenger and performance applications such as 2009-2015 Cadillac CTS, 2010-2015 Chevrolet Camaro, 2007-2014 Chevrolet Tahoe, and 2009-2013 Chevrolet Corvette. This part cross-references Stant 15158 for the same application.

Common Problems This Part Addresses

• Engine running too cool or too warm due to thermostat wear
• Temperature fluctuation during normal driving
• Corrosion-related thermostat sticking in the cooling system
• Delayed coolant circulation after cold start
• Cooling system service on GM trucks, vans, SUVs, and performance cars

Installation Notes and Tips

Verify the OE temperature rating and housing style before installation. This thermostat uses a bottom by-pass design and an O-ring seal, and the jiggle pin weep hole should be oriented to help purge trapped air during filling. Clean the sealing surfaces thoroughly and inspect the housing for wear or corrosion before reassembly.

Fits 2007-2018 Chevrolet Express 2500, N/A; Fits 2007-2018 Chevrolet Express 3500, N/A; Fits 2007-2018 Chevrolet Silverado 2500 HD, N/A; Fits 2015-2018 Chevrolet Silverado 3500, N/A; Fits 2008-2013 Chevrolet Silverado 3500, N/A; Fits 2007-2018 Chevrolet Silverado 3500 HD, N/A; Fits 2016-2018 Chevrolet Suburban 3500 HD, N/A; Fits 2018 GMC Savana 2500, N/A; Fits 2016 GMC Savana 2500, N/A; Fits 2007-2013 GMC Savana 2500, N/A; Fits 2018 GMC Savana 3500, N/A; Fits 2016 GMC Savana 3500, N/A; Fits 2007-2013 GMC Savana 3500, N/A; Fits 2016-2018 GMC Sierra 2500 HD, N/A; Fits 2007-2012 GMC Sierra 2500 HD, N/A; Fits 2016-2018 GMC Sierra 3500 HD, N/A; Fits 2007-2012 GMC Sierra 3500 HD, N/A; Fits 2014-2017 Chevrolet SS, N/A; Fits 2009-2015 Cadillac CTS, N/A; Fits 2010-2015 Chevrolet Camaro, N/A; Fits 2007-2014 Cadillac Escalade, N/A; Fits 2007-2014 Cadillac Escalade ESV, N/A; Fits 2011-2014 Chevrolet Caprice, N/A; Fits 2007-2014 Chevrolet Express 1500, N/A; Fits 2007-2014 Chevrolet Suburban 1500, N/A; Fits 2007-2014 Chevrolet Tahoe, N/A; Fits 2007-2013 Cadillac Escalade EXT, N/A; Fits 2007-2013 Chevrolet Avalanche, N/A; Fits 2010-2013 Chevrolet Cheyenne, N/A; Fits 2009-2013 Chevrolet Corvette, N/A; Fits 2007-2013 Chevrolet Silverado 1500, N/A; Fits 2007-2013 Chevrolet Silverado 2500, N/A; Fits 2007-2013 Chevrolet Suburban 2500, N/A; Fits 2007-2013 GMC Savana 1500, N/A; Fits 2009-2012 Chevrolet Colorado, N/A; Fits 2009-2012 GMC Canyon, N/A; Fits 2007-2012 GMC Sierra, N/A; Fits 2007-2012 GMC Sierra 1500, N/A; Fits 2007-2012 GMC Yukon, N/A; Fits 2007-2012 GMC Yukon XL 1500, N/A; Fits 2007-2012 GMC Yukon XL 2500, N/A; Fits 2008-2010 Hummer H3, N/A; Fits 2007-2009 Chevrolet Trailblazer, N/A; Fits 2009 GMC Envoy, N/A; Fits 2008-2009 Hummer H2, N/A; Fits 2009 Saab 9-7x, N/A; Fits 2007-2008 GMC Envoy, N/A; Fits 2007 Buick Rainier, N/A; Fits 2007 Chevrolet Silverado 1500 Classic, N/A; Fits 2007 Chevrolet Silverado 1500 HD Classic, N/A; Fits 2007 Chevrolet Silverado 2500 HD Classic, N/A; Fits 2007 Chevrolet Silverado 3500 Classic, N/A; Fits 2007 GMC Sierra 1500 Classic, N/A; Fits 2007 GMC Sierra 1500 HD Classic, N/A; Fits 2007 GMC Sierra 2500 HD Classic, N/A; Fits 2007 GMC Sierra 3500 Classic, N/A; Fits 2007 Hummer H2, N/A.

Quality Assurance

Gates Premium Thermostats are built with heavy-gauge stainless steel construction and an upgraded spring to improve corrosion resistance and temperature stability under normal operation. The 34198S follows the Gates Premium Thermostat line’s OE-style service focus for GM cooling system repairs.