Motorad 298-170 Engine Coolant Thermostat

Engine Coolant Thermostat for Toyota and Lexus

The Motorad Standard 298-170 engine coolant thermostat is built for precise temperature control in a wide range of Toyota, Lexus, Scion, and Mitsubishi applications. With a 170°F rating, copper case construction, and wax compound response, it is made to react quickly to coolant temperature changes for stable engine operation.

Key Features

• 170°F thermostat rating for controlled coolant flow
• Copper case and wax compound for fast temperature response
• Offset design with air relief valve where applicable
• OEM-style seals included where applicable
• Jiggle pin weep hole for air bleeding
• Sealing flange outside diameter: 2.2 in
• Bypass diameter: 1.09 in
• Bypass length: 1.34 in
• Flange thickness: 0.05 in
• Motorad Standard 298-170

Product Details

Motorad Standard focuses on OE-style cooling system service parts built with OEM quality materials and manufacturing processes. This thermostat is produced to meet demanding cooling system requirements and is listed for broad coverage across Toyota Tacoma, Toyota Yaris, Toyota 4Runner, Toyota Prius, Lexus GS300, Lexus IS300, and related applications. This part cross-references AMS Automotive 4107 and SKF 29870 for the same application. The Motorad 298-170 is a direct-fit cooling system service component for vehicles that require a 170°F thermostat specification.

What It Helps Address

• Engine running too cool or too warm due to thermostat wear
• Delayed coolant circulation during warm-up
• Temperature fluctuation from a sticking thermostat
• Air trapped in the cooling system after service
• Cooling system performance issues on Toyota, Lexus, Scion, and Mitsubishi models

Installation Notes and Tips

Verify the 170°F temperature specification and compare the sealing flange, bypass dimensions, and housing style before installation. Use the jiggle pin weep hole and air relief features to help purge trapped air during refill. Confirm fitment for the exact vehicle and engine configuration, especially on Toyota Tacoma, Toyota Yaris, and Lexus GS300 applications where alternate thermostat options may exist. The Motorad 298-170 is listed without a gasket or seal included, so reuse or replacement should be confirmed during service.

Quality Assurance

Manufactured by an OE supplier using OEM-quality materials and processes, this thermostat is built to meet original-equipment specifications for cooling system service. The copper case and wax compound are selected for responsive temperature control under demanding operating conditions.