Gates 33798 Engine Coolant Thermostat

OE Type Thermostat for Toyota and Lexus Applications

The Gates 33798 OE Type Thermostat is built for precise coolant temperature control and a leak-free OEM-equivalent fit. It is a direct replacement choice for a wide range of Toyota, Lexus, and Scion applications, including Toyota Tacoma, Prius, Echo, and Lexus GS300 platforms.

Key Features

• OE Type thermostat engineered for factory-style temperature regulation
• Starts to open at 180°F / 82°C for OE temperature operation
• Bottom by-pass design for the listed applications
• Steel and copper construction for durable cooling system service
• OE Performance comparison rating
• Gates 33798 thermostat for select Toyota, Lexus, and Scion vehicles

Product Details

Gates OE Type Thermostats are built to match original equipment fit and thermal behavior, helping maintain stable engine operating temperature under everyday driving conditions. This thermostat uses a bottom by-pass design and is specified with a 180°F opening temperature, making it a direct-fit cooling system service part for many Toyota Tacoma, Toyota Prius, Toyota Yaris, Lexus IS300, and related applications. The Gates 33798 is a practical replacement when restoring proper coolant flow control in vehicles that rely on OE-style thermostat calibration.

This part cross-references Dorman - HELP 46108 and Motorad 298-180 for the same application.

Vehicle Fitment

• Fits 2015-2020 Toyota Yaris, N/A; 180 Degree; OE Temperature; OE Type Thermostat
• Fits 2007-2013 Toyota Yaris, N/A; 180 Degree; OE Temperature; OE Type Thermostat
• Fits 2016-2020 Toyota Yaris R, N/A; 180 Degree; OE Temperature; OE Type Thermostat
• Fits 2017-2018 Toyota Yaris iA, N/A; 180 Degree; OE Temperature; OE Type Thermostat
• Fits 2016 Scion iA, N/A; 180 Degree; OE Temperature; OE Type Thermostat
• Fits 2012-2013 Toyota Hilux, N/A; 180 Degree; OE Temperature; OE Type Thermostat
• Fits 2010 Toyota Hilux, N/A; 180 Degree; OE Temperature; OE Type Thermostat
• Fits 2004 Toyota Hilux, N/A; 180 Degree; OE Temperature; OE Type Thermostat
• Fits 1995-2013 Toyota Tacoma, N/A; 180 Degree; OE Temperature; OE Type Thermostat
• Fits 2001-2009 Toyota Prius, N/A; 180 Degree; OE Temperature; OE Type Thermostat
• Fits 2004-2006 Scion xA, N/A; 180 Degree; OE Temperature; OE Type Thermostat
• Fits 2004-2006 Scion xB, N/A; 180 Degree; OE Temperature; OE Type Thermostat
• Fits 1993-2005 Lexus GS300, N/A; 180 Degree; OE Temperature; OE Type Thermostat
• Fits 2001-2005 Lexus IS300, N/A; 180 Degree; OE Temperature; OE Type Thermostat
• Fits 2000-2005 Toyota Echo, N/A; 180 Degree; OE Temperature; OE Type Thermostat
• Fits 1992-2000 Lexus SC300, N/A; 180 Degree; OE Temperature; OE Type Thermostat
• Fits 1996-2000 Toyota 4Runner, N/A; 180 Degree; OE Temperature; OE Type Thermostat
• Fits 1993-1998 Toyota Supra, N/A; 180 Degree; OE Temperature; OE Type Thermostat
• Fits 1994-1998 Toyota T100, N/A; 180 Degree; OE Temperature; OE Type Thermostat
• Fits 1991-1997 Toyota Previa, N/A; 180 Degree; OE Temperature; OE Type Thermostat

Common Cooling System Issues

• Engine running too cool or too warm due to thermostat wear
• Slow warm-up after cold starts
• Temperature fluctuation during normal driving
• Cooling system service on high-mileage Toyota, Lexus, or Scion vehicles
• Replacement after thermostat sticking or loss of proper opening control

Installation Notes and Tips

Verify the OE temperature rating, by-pass design, and flange dimensions before installation. Clean the thermostat housing and sealing surfaces thoroughly, and inspect the coolant condition, hoses, and housing for wear before reassembly. This thermostat does not include an installation tool, so use the correct service procedure for the vehicle and refill the cooling system with the proper coolant specification after installation.

Quality Assurance

Gates OE Type Thermostats are engineered for OEM-equivalent fit and precise temperature control. The 33798 is built to meet the needs of the listed Toyota, Lexus, and Scion applications with a focus on consistent cooling system operation and leak-free sealing performance.