Gates 33878 Engine Coolant Thermostat - Lower

OE Type Thermostat for Precise Cooling Control

Gates 33878 is an OE Type Engine Coolant Thermostat built for accurate temperature regulation and a leak-free OEM-equivalent fit. It opens at 180 degrees and uses a bottom by-pass design for applications that call for factory-style cooling system performance.

Compatible With select Mitsubishi Outlander, Nissan Titan, Toyota Tundra, Lexus GX470, and Infiniti QX56 applications, this thermostat supports consistent coolant flow control across a wide range of import vehicles. Gates OE Type Thermostats are engineered for direct replacement service, and part number 33878 is listed across multiple OE-style cross references for the same application.

Key Features

• OE Type Thermostat with OEM-equivalent fit and temperature control
• 180 degree start-to-open temperature for specified applications
• Bottom by-pass design for factory-style coolant routing
• Steel, brass, and copper construction
• Jiggle pin weep hole included for air bleeding during service
• OE Performance comparison rating

Detailed Product Overview

This Gates OE Type Thermostat is built to match the cooling system requirements of many Asian and import vehicles, including 2000-2009 Toyota Tundra, 2003-2009 Toyota 4Runner, 2004-2015 Nissan Titan, 2004-2013 Infiniti QX56, and 2007-2020 Mitsubishi Outlander applications. The 33878 thermostat is specified for precise opening temperature control, helping the engine reach and maintain the correct operating range under normal driving conditions.

Its steel, brass, and copper construction supports dependable thermal response, while the OE-style sealing dimensions help promote a proper fit in the thermostat housing. This part cross-references Four Seasons 35128 and Motorad 297-180 for the same application.

What This Thermostat Helps Address

• Engine running too cool or too warm due to thermostat wear
• Delayed warm-up after cold starts
• Temperature fluctuation from inconsistent coolant flow control
• Coolant bypass issues in OE-style cooling systems
• Service replacement needs on vehicles such as Nissan Armada, Toyota Sequoia, and Lexus LS430

Installation Notes and Tips

• Verify the 180 degree opening specification before installation.
• Confirm housing dimensions and by-pass style match the original part.
• Inspect the thermostat housing, sealing surfaces, and coolant condition during service.
• Use the jiggle pin orientation recommended by the vehicle service procedure to help purge trapped air.
• Follow the manufacturer cooling system bleed procedure after installation.

Quality Assurance

Gates OE Type Thermostats are engineered to provide precise temperature control and leak-free, OEM-equivalent fit every time. Part number 33878 is built to OE performance expectations for direct replacement service across listed Mitsubishi, Nissan, Toyota, Lexus, Infiniti, Hyundai, Kia, Acura, Honda, Chrysler, Dodge, Volvo, and related applications.