Gates 33946 Engine Coolant Thermostat - Front
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Gates
 OE Type Thermostat

Gates 33946 Engine Coolant Thermostat - Front

Brand Gates 33946
Position Front
0
.73
1
1.19
By-Pass Flange Diameter (in) 1.19
Design Bottom By-Pass
Design Bottom By-Pass
Gasket Quantity 0
Height 2.09
Height Between Flanges 1.41
Height from Flange (in) .73
Includes Installation Tool No
Installation Tool Included No
Jiggle Pin Weep Hole No
Material Steel, Copper
Material Steel, Copper
Number of Gaskets 0
Number of Jiggle Pins/Check Valves 0
Number of Seals 1
OE Comparison Rating OE Performance
Seal Type O-Ring
Sealing Flange Outside Diameter 2.12
Start to Open Temperature 85
Start to Open Temperature 185
Type OE Type Thermostat
Product line OE Type Thermostat
Fits Chevrolet and GMC · 118 vehicles

OE type thermostat. Provides precise temperature control with OEM-equivalent fit.

Steel and copper construction. Built with durable materials for dependable cooling performance.

O-ring seal. Helps deliver a leak-free installation.

Cross-references ACI 389195, AP Exhaust 14728 and Gates 33946 for the same application. See all 8.

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Not what you need? See all Engine Coolant Thermostat options

OE Type Thermostat for Precise Cooling Control

The Gates 33946 OE Type Thermostat is built for accurate engine temperature regulation and a leak-free seal. It is an OE-style replacement for front-mounted cooling system applications on Chevrolet Silverado 2500 HD, Silverado 3500 HD, GMC Sierra 2500 HD, and Sierra 3500 HD models, along with select Express and Savana vans.

Gates OE Type Thermostats focus on OEM-equivalent fit and consistent opening performance. This Gates 33946 thermostat uses a bottom by-pass design with a steel and copper construction, an O-ring seal, and a 185-degree start-to-open temperature for factory-style cooling system operation.

  • OE Type Thermostat with OE Performance comparison rating
  • 185-degree start-to-open temperature for factory-spec engine warm-up control
  • Bottom by-pass design for the listed GM truck and van applications
  • Steel and copper construction for cooling system durability
  • O-ring seal for leak-resistant installation
  • No jiggle pin weep hole and no installation tool included
  • Compatible with front-position applications on Silverado, Sierra, Express, and Savana models

Product Details and Fitment

Gates 33946 is an engine coolant thermostat engineered for direct replacement in GM cooling systems that call for a 185-degree OE-style thermostat. It is a strong match for drivers searching for a 2001-2019 Chevrolet Silverado 2500 HD front thermostat, a 2007-2019 Chevrolet Silverado 3500 HD front thermostat, or a 2001-2016 GMC Sierra 2500 HD front thermostat. It also serves select Chevrolet Express 2500, Express 3500, GMC Savana 2500, and GMC Savana 3500 front applications. This part cross-references Motorad 447-185 for the same application.

Common Cooling Issues This Part Can Address

  • Engine running cooler or hotter than the specified operating range
  • Delayed warm-up after cold starts
  • Temperature fluctuation caused by a worn thermostat
  • Coolant seepage at the thermostat seal area
  • Loss of stable coolant flow control in front-mounted GM cooling systems

Installation Notes and Tips

Verify the vehicle’s original thermostat temperature rating and bottom by-pass configuration before installation. Clean the housing sealing surfaces thoroughly and inspect the O-ring seat for debris or corrosion. Because this Gates 33946 thermostat is listed for front-position applications, confirm the exact engine and cooling system setup on Silverado, Sierra, Express, or Savana models before replacing the part.

Quality Assurance

Gates OE Type Thermostats are engineered to deliver precise temperature control and OEM-equivalent fit. The 33946 is built to match the listed application requirements for dependable cooling system service.

Related reading

This part fits 118 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersFuel TypePositionNotes
2019ChevroletSilverado 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2019ChevroletSilverado 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2018ChevroletSilverado 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2018ChevroletSilverado 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2017ChevroletSilverado 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2017ChevroletSilverado 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2016ChevroletExpress 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2016ChevroletExpress 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2016ChevroletSilverado 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2016ChevroletSilverado 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2016GMCSavana 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2016GMCSavana 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2016GMCSierra 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2016GMCSierra 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2015ChevroletExpress 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2015ChevroletExpress 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2015ChevroletSilverado 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2015ChevroletSilverado 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2015GMCSavana 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2015GMCSavana 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2015GMCSierra 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2015GMCSierra 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2014ChevroletExpress 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2014ChevroletExpress 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2014ChevroletSilverado 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2014ChevroletSilverado 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2014GMCSavana 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2014GMCSavana 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2014GMCSierra 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2014GMCSierra 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2013ChevroletExpress 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2013ChevroletExpress 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2013ChevroletSilverado 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2013ChevroletSilverado 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2013GMCSavana 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2013GMCSavana 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2013GMCSierra 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2013GMCSierra 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2012ChevroletExpress 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2012ChevroletExpress 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2012ChevroletSilverado 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2012ChevroletSilverado 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2012GMCSavana 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2012GMCSavana 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2012GMCSierra 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2012GMCSierra 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2011ChevroletExpress 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2011ChevroletExpress 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2011ChevroletSilverado 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2011ChevroletSilverado 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2011GMCSavana 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2011GMCSavana 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2011GMCSierra 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2011GMCSierra 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2010ChevroletExpress 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2010ChevroletExpress 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2010ChevroletSilverado 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2010ChevroletSilverado 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2010GMCSavana 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2010GMCSavana 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2010GMCSierra 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2010GMCSierra 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2009ChevroletExpress 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2009ChevroletExpress 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2009ChevroletSilverado 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2009ChevroletSilverado 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2009GMCSavana 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2009GMCSavana 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2009GMCSierra 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2009GMCSierra 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2008ChevroletExpress 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2008ChevroletExpress 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2008ChevroletSilverado 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2008ChevroletSilverado 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2008GMCSavana 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2008GMCSavana 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2008GMCSierra 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2008GMCSierra 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2007ChevroletExpress 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2007ChevroletExpress 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2007ChevroletSilverado 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2007ChevroletSilverado 2500 HD Classic6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2007ChevroletSilverado 3500 Classic6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2007ChevroletSilverado 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2007GMCSavana 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2007GMCSavana 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2007GMCSierra 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2007GMCSierra 2500 HD Classic6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2007GMCSierra 3500 Classic6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2007GMCSierra 3500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2006ChevroletExpress 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2006ChevroletExpress 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2006ChevroletSilverado 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2006ChevroletSilverado 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2006GMCSavana 25006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2006GMCSavana 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2006GMCSierra 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2006GMCSierra 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2005ChevroletSilverado 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2005ChevroletSilverado 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2005GMCSierra 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2005GMCSierra 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2004ChevroletSilverado 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2004ChevroletSilverado 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2004GMCSierra 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2004GMCSierra 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2003ChevroletSilverado 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2003ChevroletSilverado 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2003GMCSierra 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2003GMCSierra 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2002ChevroletSilverado 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2002ChevroletSilverado 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2002GMCSierra 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2002GMCSierra 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2001ChevroletSilverado 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2001ChevroletSilverado 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2001GMCSierra 2500 HD6.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
2001GMCSierra 35006.6LV8DIESELFront185 Degree; OE Temperature; Seal included; OE Type Thermostat
Directly replaces or cross-references 8 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
ACI — 389195AP Exhaust — 14728Gates — 33946Motorad — 447-185Walker Exhaust — 3159812T99D4479597241129