Gates 33857 Engine Coolant Thermostat
OE Quality 60-Day Returns
Gates
 OE Type Thermostat

Gates 33857 Engine Coolant Thermostat

Brand Gates 33857
0
0
.70
Design Reverse Poppet
Design Reverse Poppet
Gasket Quantity 0
Height 1.53
Height Between Flanges .83
Height from Flange (in) .70
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 0
OE Comparison Rating OE Performance
Sealing Flange Outside Diameter 2.2
Start to Open Temperature 77
Start to Open Temperature 170
Type OE Type Thermostat
Product line OE Type Thermostat
Fits Subaru · 113 vehicles

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

Reverse poppet design. Supports efficient coolant flow and stable operation.

Steel and copper construction. Built with durable materials for dependable sealing.

Cross-references Beck/Arnley 143-0710, Carlson 14147 and CSF 110 for the same application. See all 19.

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Gates 33857 OE Type Thermostat for Subaru Cooling Systems

Gates 33857 is an OE Type Engine Coolant Thermostat built for precise temperature regulation and a leak-free OEM-equivalent fit. This 170-degree thermostat is a direct-fit cooling system service part for a wide range of Subaru applications, including WRX, WRX STI, Legacy, Outback, Impreza, Forester, and Baja models.

Key Features

  • OE Type thermostat for factory-style cooling system performance
  • 170-degree start-to-open temperature for alternate-temperature applications
  • Reverse poppet design for controlled coolant flow
  • Steel and copper construction
  • OE Performance comparison rating
  • Fits Subaru WRX, WRX STI, Legacy, Outback, Impreza, Forester, and Baja applications
  • Gates part number 33857

Product Details

The Gates OE Type Thermostat line is engineered for accurate temperature control and consistent sealing at the housing interface. Part number 33857 uses a reverse poppet design and a 170-degree opening point, making it a fitment-based choice for Subaru cooling system service where stable operating temperature matters. The steel and copper construction supports dependable thermal response in everyday driving and under load. This thermostat cross-references Motorad 294-170 and 7294-170 for the same application.

Compatible With 2020-2021 Subaru WRX STI, N/A; 2013-2018 Subaru WRX STI, N/A; 2015-2019 Subaru Legacy, N/A; 1990-2009 Subaru Legacy, N/A; 2019 Subaru Outback, N/A; 2015-2017 Subaru Outback, N/A; 2000-2009 Subaru Outback, N/A; 2012-2016 Subaru WRX, N/A; 1993-2014 Subaru Impreza, N/A; 1998-2013 Subaru Forester, N/A; and 2003-2006 Subaru Baja, N/A.

What It Helps 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
  • Cooling system service on Subaru Legacy, Outback, WRX, WRX STI, Impreza, Forester, and Baja models

Installation Notes and Tips

Verify the thermostat housing condition before installation and clean the sealing surfaces thoroughly. Confirm the 170-degree specification matches the vehicle’s cooling setup before service. This thermostat does not include an installation tool, gasket, seals, or jiggle pin/check valve. Always refill and bleed the cooling system according to Subaru service procedures after replacement.

Quality Assurance

Gates OE Type Thermostats are built to deliver OEM-equivalent fit and precise temperature control for cooling system maintenance. Gates part number 33857 is manufactured to support consistent sealing and repeatable thermostat operation in the listed Subaru applications.

Related reading

This part fits 113 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersFuel TypePositionNotes
2021SubaruWRX STI2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2020SubaruWRX STI2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2019SubaruLegacy3.6LH6GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2019SubaruOutback3.6LH6GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2018SubaruLegacy3.6LH6GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2018SubaruWRX STI2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2017SubaruLegacy3.6LH6GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2017SubaruOutback3.6LH6GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2017SubaruWRX STI2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2016SubaruLegacy3.6LH6GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2016SubaruOutback3.6LH6GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2016SubaruWRX2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2016SubaruWRX STI2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2015SubaruLegacy3.6LH6GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2015SubaruOutback3.6LH6GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2015SubaruWRX2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2015SubaruWRX STI2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2014SubaruImpreza2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2014SubaruWRX2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2014SubaruWRX STI2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2013SubaruForester2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2013SubaruImpreza2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2013SubaruWRX2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2013SubaruWRX STI2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2012SubaruForester2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2012SubaruImpreza2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2012SubaruWRX2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2011SubaruForester2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2011SubaruImpreza2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2010SubaruForester2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2010SubaruImpreza2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2009SubaruForester2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2009SubaruImpreza2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2009SubaruLegacy2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2009SubaruOutback2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2008SubaruForester2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2008SubaruImpreza2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2008SubaruLegacy2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2008SubaruOutback2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2007SubaruForester2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2007SubaruImpreza2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2007SubaruLegacy2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2007SubaruOutback2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2006SubaruBaja2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2006SubaruForester2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2006SubaruImpreza2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2006SubaruLegacy2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2006SubaruOutback2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2005SubaruBaja2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2005SubaruForester2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2005SubaruImpreza2.0LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2005SubaruImpreza2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2005SubaruLegacy2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2005SubaruOutback2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2004SubaruBaja2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2004SubaruForester2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2004SubaruImpreza2.0LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2004SubaruImpreza2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2004SubaruLegacy2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2004SubaruOutback2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2004SubaruOutback3.0LH6GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2003SubaruBaja2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2003SubaruForester2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2003SubaruImpreza2.0LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2003SubaruImpreza2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2003SubaruLegacy2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2003SubaruOutback2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2003SubaruOutback3.0LH6GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2002SubaruForester2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2002SubaruImpreza2.0LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2002SubaruImpreza2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2002SubaruLegacy2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2002SubaruOutback2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2002SubaruOutback3.0LH6GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2001SubaruForester2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2001SubaruImpreza2.2LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2001SubaruImpreza2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2001SubaruLegacy2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2001SubaruOutback2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2001SubaruOutback3.0LH6GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2000SubaruForester2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2000SubaruImpreza2.2LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2000SubaruImpreza2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2000SubaruLegacy2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
2000SubaruOutback2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1999SubaruForester2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1999SubaruImpreza2.2LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1999SubaruImpreza2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1999SubaruLegacy2.2LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1999SubaruLegacy2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1998SubaruForester2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1998SubaruImpreza2.2LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1998SubaruImpreza2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1998SubaruLegacy2.2LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1998SubaruLegacy2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1997SubaruImpreza1.8LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1997SubaruImpreza2.2LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1997SubaruLegacy2.2LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1997SubaruLegacy2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1996SubaruImpreza1.8LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1996SubaruImpreza2.2LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1996SubaruLegacy2.2LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1996SubaruLegacy2.5LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1995SubaruImpreza1.8LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1995SubaruImpreza2.2LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1995SubaruLegacy2.2LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1994SubaruImpreza1.8LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1994SubaruLegacy2.2LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1993SubaruImpreza1.8LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1993SubaruLegacy2.2LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1992SubaruLegacy2.2LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1991SubaruLegacy2.2LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
1990SubaruLegacy2.2LH4GASN/A170 Degree; Alternate Temperature; OE Type Thermostat
Directly replaces or cross-references 19 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Beck/Arnley — 143-0710Carlson — 14147CSF — 110Four Seasons — 35147Four Seasons — 46147Gates — 33857Motorad — 294-170Motorad — 7294-170394-170494-170414721200AA00021200AA07021200AA07121200AA1702914732637133749TX14378D