Motorad 381-170 Engine Coolant Thermostat

Engine Cooling Control for OE Fitment

The Motorad Standard 381-170 engine coolant thermostat is built for precise temperature control in demanding cooling systems. With a 170°F start-to-open rating, it supports stable operating temperature for select Acura, Honda, and Nissan applications, including Acura ILX, Honda Civic, Honda CR-Z, Nissan Frontier, Nissan 200SX, and Nissan Pickup.

Motorad Standard 381-170 is manufactured to OEM specifications using OE-supplier processes and materials. The copper case and wax compound are engineered for quick reaction to coolant temperature changes, while the offset design and air relief valve help support proper coolant flow and system bleeding where applicable.

Key Features

• 170°F start-to-open temperature for OE-specified cooling control
• Copper case and wax compound for responsive temperature regulation
• Offset design with jiggle pin weep hole for air management
• OEM-style seals included where applicable
• Standard thermostat design for direct replacement service
• Cross-reference: Gates 38170

Detailed Product Overview

This Motorad thermostat is a standard engine coolant thermostat designed for vehicles that require a 170-degree Fahrenheit opening temperature. It measures 2.13 inches at the sealing flange outside diameter, 2.09 inches in height, and 1.46 inches between flanges, with a 1.09-inch bypass diameter and 1.31-inch bypass length. The jiggle pin weep hole helps purge trapped air during filling and service, which supports more consistent coolant circulation after installation. The Motorad 381-170 is a practical OE-style replacement for cooling system maintenance on applications such as 2013-2015 Acura ILX, 2014-2015 Honda Civic, and 2014 Honda CR-Z.

What It Helps Address

• Engine running too cool or too warm due to thermostat wear
• Delayed warm-up after cold starts
• Temperature fluctuation from a sticking thermostat
• Coolant flow issues caused by poor thermostat response
• Air trapped in the cooling system after service

Installation Notes and Tips

Verify the OE-specified 170°F thermostat requirement before installation. Inspect the housing, sealing surfaces, and coolant condition during service, and replace any damaged components as needed. This thermostat does not include a gasket or seal, and no installation tool is included. Proper coolant bleeding is important after installation, especially on systems that use an air relief valve or jiggle pin design.

Quality Assurance

Motorad manufactures this thermostat with OEM-quality materials and processes as an OE supplier, with construction intended to meet the demands of modern automotive cooling systems. Part number 381-170 is built to OE specifications for consistent fit and temperature control.