Motorad 391-170 Engine Coolant Thermostat Housing Assembly

Integrated Thermostat Housing for Nissan and INFINITI

Motorad 391-170 is an integrated housing thermostat assembly built for vehicles that need precise coolant temperature control and a direct-fit housing replacement. This 170 degree thermostat housing assembly includes the thermostat, housing, and gasket for service on select Nissan Frontier, Xterra, Pathfinder, 350Z, and INFINITI applications.

Key Features

• 170 degree opening temperature for OE-specified cooling performance
• Integrated thermostat housing assembly with gasket included
• Bleeder hole and jiggle pin included for air relief during service
• 3 bolt holes for secure mounting
• 2 outlet ports with 1.38 in and 0.50 in outlet diameters
• Aluminum, stainless steel, and copper construction
• Silver finish
• Motorad 391-170 for direct replacement service

Product Details

Motorad’s Integrated Housing Thermostat line focuses on OE-style replacement parts that combine the thermostat and housing into one service assembly. The 391-170 uses OEM specifications and manufacturing processes, with a copper case and wax compound for responsive temperature changes in the coolant. Offset design and OEM-style sealing features are used where applicable to support proper fitment on Nissan and INFINITI cooling systems.

This part cross-references Dorman OE Solutions 902-5149 for the same application. Motorad 391-170 is a practical choice for 2001-2020 Nissan Frontier, Xterra, Pathfinder, 350Z, NV1500, NV2500, NV3500, and select INFINITI FX35, G35, M35, and QX4 fitments.

What This Part Helps Address

• Engine running too cool or too hot due to thermostat wear
• Coolant leaks at the thermostat housing or seal surface
• Air trapped in the cooling system after service
• Delayed coolant flow regulation during warm-up
• Housing corrosion or deterioration on older cooling assemblies

Installation Notes

Verify engine application and temperature rating before installation. This assembly includes the thermostat, housing, and gasket; bolts and mounting hardware are not included. Clean the mating surfaces thoroughly, confirm the bleeder hole and jiggle pin orientation, and follow the vehicle service procedure for coolant refill and air bleeding.

• Fits 2020 Nissan Frontier, N/A
• Fits 2017 Nissan Frontier, N/A
• Fits 2005-2013 Nissan Frontier, N/A
• Fits 2017 Nissan NV1500, N/A
• Fits 2012-2013 Nissan NV1500, N/A
• Fits 2017 Nissan NV2500, N/A
• Fits 2012-2013 Nissan NV2500, N/A
• Fits 2017 Nissan NV3500, N/A
• Fits 2012-2013 Nissan NV3500, N/A
• Fits 2005-2013 Nissan Xterra, N/A
• Fits 2005-2012 Nissan Pathfinder, N/A
• Fits 2009-2012 Suzuki Equator, N/A
• Fits 2003-2008 INFINITI FX35, N/A
• Fits 2006-2008 INFINITI M35, N/A
• Fits 2003-2007 INFINITI G35, N/A
• Fits 2003-2006 Nissan 350Z, N/A
• Fits 2003-2004 Nissan Pathfinder, N/A
• Fits 2001-2003 INFINITI QX4, N/A
• Fits 2001-2002 Nissan Pathfinder, N/A

Quality Assurance

Motorad manufactures this integrated housing thermostat with OEM-quality materials and OE-supplier standards to meet demanding automotive cooling requirements. The 391-170 is built to OE specifications for consistent temperature control and dependable service in select Nissan and INFINITI cooling systems.