Gates 33877 Engine Coolant Thermostat - Lower

OE Type Cooling Control for Select Applications

The Gates 33877 OE Type Thermostat is built for precise engine temperature control and a leak-free OEM-equivalent fit. It is a 170-degree engine coolant thermostat for a wide range of import and domestic applications, including Nissan Titan, Toyota 4Runner, and Lexus GX470 fitments.

Key Features

• OE Type Thermostat construction for factory-style cooling system performance
• 170-degree start-to-open temperature for the listed applications
• Steel and copper construction for durable thermal response
• Bottom by-pass design for the specified cooling system layouts
• OE Performance comparison rating
• Gates part number 33877 for direct catalog lookup

Product Details

Gates OE Type Thermostats are engineered to deliver accurate temperature regulation and a secure seal in the cooling system. The 33877 thermostat uses a steel and copper design with a bottom by-pass configuration, a 2.51-inch sealing flange outside diameter, and a 1.71-inch height between flanges. It starts to open at 170 degrees, making it a direct-fit cooling service part for many vehicles that call for this temperature range. This part cross-references Motorad 301-170 for the same application.

Fitment coverage includes 2004-2010 Nissan TITAN, 2003-2009 Toyota 4Runner, 2003-2006 Lexus GX470, 2001-2006 Hyundai Santa Fe, and 2000-2005 Toyota Tundra. It also applies to select Nissan Armada, Pathfinder, Infiniti QX56, Mitsubishi Eclipse, and Kia Sorento applications where a 170-degree OE type thermostat is specified. Gates 33877 is a practical choice when servicing vehicles that need stable coolant flow control and OEM-style thermostat operation.

What It Helps Address

• Engine running too cool or too warm due to thermostat wear
• Delayed coolant circulation after cold starts
• Temperature fluctuation during normal driving
• Cooling system service on vehicles requiring a 170-degree thermostat
• Replacement of a thermostat with a leaking or inconsistent seal

Installation Notes and Tips

Verify the thermostat temperature rating, by-pass design, and flange dimensions against the original part before installation. Clean the housing mating surfaces thoroughly and inspect the cooling system for contamination, hose wear, or damaged seals. Because this thermostat does not include an installation tool, use the correct service procedure and torque specifications for the vehicle. Confirm the application by year, make, model, and position, especially on listings that specify lower or N/A placement.

Quality Assurance

Gates positions this OE Type Thermostat line as an OEM-equivalent replacement solution focused on precise temperature control and leak-free fitment. Part number 33877 is built to meet the dimensional and performance requirements expected for the listed applications.