Motorad 5294-170 Engine Coolant Thermostat

Motorad UltraStat 170F Thermostat for Subaru

The Motorad UltraStat engine coolant thermostat is built for Subaru cooling systems that call for a 170 degree Fahrenheit opening temperature. Part number 5294-170 is a direct-fit style thermostat for a wide range of Subaru Legacy, Outback, Impreza, Forester, WRX, WRX STI, Tribeca, and Baja applications.

UltraStat thermostats use heavy-gauge stainless steel construction for corrosion resistance and long service life. The 170F calibration helps maintain OE-specified coolant control, while the jiggle pin weep hole supports air bleeding during service.

Key Features

• 170 degree Fahrenheit thermostat calibration
• Heavy-gauge stainless steel construction
• Corrosion-resistant design for cooling system durability
• Jiggle pin weep hole included
• Sealing flange outside diameter: 2.2 in
• Flange thickness: 0.05 in
• No gasket or seal included
• No installation tool included

Product Details

Motorad UltraStat part number 5294-170 is an engine coolant thermostat engineered for Subaru cooling system service where a 170F thermostat is specified. The UltraStat line focuses on stainless steel construction and valve control that helps reduce abrupt temperature changes in the cooling circuit. This makes it a practical choice for Subaru Legacy, Subaru Outback, Subaru Impreza, Subaru Forester, Subaru WRX, and Subaru WRX STI maintenance when replacing a worn or sticking thermostat.

This part cross-references Four Seasons 46147 for the same application. It also cross-references 46457 and MU55147 for related fitment coverage.

Common Problems This Part Can Address

• Engine running cooler or warmer than specified due to thermostat wear
• Delayed coolant flow control from a sticking thermostat
• Cooling system temperature fluctuation during normal driving
• Corrosion-related thermostat failure in the housing area
• Air trapped in the cooling system after thermostat service

Installation Notes and Tips

Verify the OE-specified thermostat temperature before installation. Inspect the thermostat housing, sealing surfaces, and coolant condition before reassembly. Because no gasket or seal is included, confirm the correct sealing component for the application before service. The jiggle pin weep hole should be oriented to help purge trapped air during filling and bleeding.

Compatible With Subaru Legacy 1990-2009 and 2015-2019, Subaru Outback 2000-2009 and 2015-2019, Subaru Impreza 1993-2014, Subaru Forester 1998-2013, Subaru WRX 2013-2014, Subaru WRX STI 2013-2019 and 2020, Subaru Tribeca 2008-2013, Subaru B9 Tribeca 2006-2007, and Subaru Baja 2003-2006.

Quality Assurance

Motorad UltraStat thermostats are built with stainless steel construction and corrosion-resistant materials to support long-term cooling system service. Part number 5294-170 is designed to meet OE-specified temperature requirements for listed Subaru applications.