Gates 33947 Engine Coolant Thermostat - Rear
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Gates
 OE Type Thermostat

Gates 33947 Engine Coolant Thermostat - Rear

Brand Gates 33947
Position Rear
.71
1
2
Design Offset Reverse Poppet
Design Offset Reverse Poppet
Gasket Quantity 0
Height 1.71
Height Between Flanges 1
Height from Flange (in) .71
Includes Installation Tool No
Installation Tool Included No
Jiggle Pin Weep Hole Yes
Material Steel, Brass
Material Steel, Brass
Number of Gaskets 0
Number of Jiggle Pins/Check Valves 2
Number of Seals 1
OE Comparison Rating OE Performance
Seal Type O-Ring
Sealing Flange Outside Diameter 2.13
Start to Open Temperature 82
Start to Open Temperature 180
Type OE Type Thermostat
Product line OE Type Thermostat
Fits Chevrolet and GMC · 122 vehicles

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

Steel and brass construction. Built with an O-ring seal and offset reverse poppet design.

Jiggle pin weep holes. Helps vent trapped air for smoother cooling system operation.

Cross-references Febi-Bilstein 14738, Gates 33947 and Motorad 448-180 for the same application. See all 10.

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Not what you need? See all Engine Coolant Thermostat options

Gates OE Type Thermostat for GM HD Cooling Systems

Gates 33947 is an OE Type Engine Coolant Thermostat built for precise temperature control and a leak-free OEM-equivalent fit. It is a direct replacement for rear thermostat applications on select Chevrolet Silverado HD, GMC Sierra HD, Express, and Savana models.

The Gates OE Type Thermostat line focuses on factory-style fit and temperature regulation for vehicles that depend on stable coolant flow. For Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Sierra 2500 HD, and GMC Sierra 3500 HD applications, this thermostat helps maintain the correct operating temperature with OE-style construction.

  • OE Type Thermostat with OE Performance comparison rating
  • Start-to-open temperature: 180°F / 82°C
  • Offset reverse poppet design for factory-style coolant control
  • Steel and brass construction
  • O-ring seal type with jiggle pin weep hole
  • Sealing flange outside diameter: 2.13 in.
  • Height: 1.71 in.; height between flanges: 1 in.; height from flange: 0.71 in.
  • Compatible with rear thermostat locations on listed GM trucks and vans

This Gates 33947 thermostat is engineered to provide accurate coolant temperature regulation and an OEM-equivalent fit for rear cooling-system service. It is a practical replacement for high-duty GM platforms where consistent engine temperature matters, including Chevrolet Silverado 2500 HD and GMC Sierra 3500 HD rear applications. This part cross-references Febi-Bilstein 14738 for the same application.

Common Cooling-System Problems It Can Address

  • Engine running too cool or taking too long to reach operating temperature
  • Temperature fluctuation caused by a worn thermostat
  • Coolant flow issues related to a sticking thermostat valve
  • Leak concerns at the thermostat sealing surface
  • Service replacement for rear thermostat locations on GM HD trucks and vans

Installation Notes and Tips

Verify the rear thermostat location and confirm the 180°F specification before installation. Inspect the sealing surface, replace the O-ring seal as needed, and ensure the jiggle pin weep hole is oriented correctly during assembly. This thermostat does not include an installation tool.

Quality Assurance

Gates OE Type Thermostats are built to deliver precise temperature control and an OEM-equivalent fit for service replacement use. Part number 33947 is made for consistent cooling-system performance in the listed Chevrolet and GMC applications.

  • Fits 2020 Chevrolet Silverado 2500 HD, rear
  • Fits 2020 Chevrolet Silverado 3500 HD, rear
  • Fits 2001-2019 Chevrolet Silverado 2500 HD, rear
  • Fits 2007-2019 Chevrolet Silverado 3500 HD, rear
  • Fits 2019 GMC Sierra 2500 HD, rear
  • Fits 2001-2016 GMC Sierra 2500 HD, rear
  • Fits 2019 GMC Sierra 3500 HD, rear
  • Fits 2007-2016 GMC Sierra 3500 HD, rear
  • Fits 2006-2016 Chevrolet Express 2500, rear
  • Fits 2006-2016 Chevrolet Express 3500, rear
  • Fits 2006-2016 GMC Savana 2500, rear
  • Fits 2006-2016 GMC Savana 3500, rear
  • Fits 2007 Chevrolet Silverado 2500 HD Classic, rear
  • Fits 2007 Chevrolet Silverado 3500 Classic, rear
  • Fits 2007 GMC Sierra 2500 HD Classic, rear
  • Fits 2007 GMC Sierra 3500 Classic, rear
  • Fits 2001-2006 Chevrolet Silverado 3500, rear
  • Fits 2001-2006 GMC Sierra 3500, rear

Related reading

This part fits 122 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersFuel TypePositionNotes
2020ChevroletSilverado 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; OE Type Thermostat
2020ChevroletSilverado 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; OE Type Thermostat
2019ChevroletSilverado 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2019ChevroletSilverado 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2019GMCSierra 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2019GMCSierra 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2018ChevroletSilverado 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2018ChevroletSilverado 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2017ChevroletSilverado 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2017ChevroletSilverado 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2016ChevroletExpress 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2016ChevroletExpress 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2016ChevroletSilverado 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2016ChevroletSilverado 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2016GMCSavana 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2016GMCSavana 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2016GMCSierra 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2016GMCSierra 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2015ChevroletExpress 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2015ChevroletExpress 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2015ChevroletSilverado 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2015ChevroletSilverado 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2015GMCSavana 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2015GMCSavana 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2015GMCSierra 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2015GMCSierra 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2014ChevroletExpress 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2014ChevroletExpress 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2014ChevroletSilverado 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2014ChevroletSilverado 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2014GMCSavana 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2014GMCSavana 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2014GMCSierra 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2014GMCSierra 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2013ChevroletExpress 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2013ChevroletExpress 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2013ChevroletSilverado 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2013ChevroletSilverado 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2013GMCSavana 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2013GMCSavana 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2013GMCSierra 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2013GMCSierra 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2012ChevroletExpress 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2012ChevroletExpress 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2012ChevroletSilverado 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2012ChevroletSilverado 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2012GMCSavana 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2012GMCSavana 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2012GMCSierra 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2012GMCSierra 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2011ChevroletExpress 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2011ChevroletExpress 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2011ChevroletSilverado 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2011ChevroletSilverado 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2011GMCSavana 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2011GMCSavana 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2011GMCSierra 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2011GMCSierra 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2010ChevroletExpress 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2010ChevroletExpress 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2010ChevroletSilverado 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2010ChevroletSilverado 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2010GMCSavana 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2010GMCSavana 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2010GMCSierra 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2010GMCSierra 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2009ChevroletExpress 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2009ChevroletExpress 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2009ChevroletSilverado 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2009ChevroletSilverado 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2009GMCSavana 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2009GMCSavana 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2009GMCSierra 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2009GMCSierra 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2008ChevroletExpress 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2008ChevroletExpress 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2008ChevroletSilverado 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2008ChevroletSilverado 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2008GMCSavana 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2008GMCSavana 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2008GMCSierra 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2008GMCSierra 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2007ChevroletExpress 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2007ChevroletExpress 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2007ChevroletSilverado 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2007ChevroletSilverado 2500 HD Classic6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2007ChevroletSilverado 3500 Classic6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2007ChevroletSilverado 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2007GMCSavana 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2007GMCSavana 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2007GMCSierra 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2007GMCSierra 2500 HD Classic6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2007GMCSierra 3500 Classic6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2007GMCSierra 3500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2006ChevroletExpress 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2006ChevroletExpress 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2006ChevroletSilverado 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2006ChevroletSilverado 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2006GMCSavana 25006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2006GMCSavana 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2006GMCSierra 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2006GMCSierra 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2005ChevroletSilverado 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2005ChevroletSilverado 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2005GMCSierra 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2005GMCSierra 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2004ChevroletSilverado 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2004ChevroletSilverado 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2004GMCSierra 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2004GMCSierra 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2003ChevroletSilverado 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2003ChevroletSilverado 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2003GMCSierra 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2003GMCSierra 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2002ChevroletSilverado 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2002ChevroletSilverado 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2002GMCSierra 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2002GMCSierra 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2001ChevroletSilverado 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2001ChevroletSilverado 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2001GMCSierra 2500 HD6.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
2001GMCSierra 35006.6LV8DIESELRear180 Degree; OE Temperature; Seal included; OE Type Thermostat
Directly replaces or cross-references 10 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Febi-Bilstein — 14738Gates — 33947Motorad — 448-180131-131316784474844880390180972411308973007872