Motorad 391-180 Engine Coolant Thermostat Housing Assembly - Upper

Integrated Thermostat Housing for Nissan Cooling Systems

Motorad 391-180 is an integrated engine coolant thermostat housing assembly built for OE-style cooling system service. It uses a 180°F opening temperature, includes the thermostat, housing, and gasket, and is specified for select Nissan, INFINITI, and Suzuki applications.

This Motorad Integrated Housing Thermostat is built with OEM-quality materials and processes to handle demanding cooling system conditions. The copper case and wax compound support quick response to coolant temperature changes, while the offset design, air relief valve, bleeder hole, and jiggle pin help simplify coolant service.

Key Features

• Part number: 391-180
• Integrated engine coolant thermostat housing assembly
• 180°F opening temperature / start-to-open temperature
• Includes thermostat, housing, and paper gasket
• Bleeder hole and jiggle pin included
• Two outlet ports with 1.38 in and 0.50 in outlet diameters
• Constructed from aluminum, stainless steel, and copper
• OE-style seals included where applicable

Detailed Description

Motorad 391-180 is engineered as an OE supplier replacement for vehicles that use an integrated thermostat housing design. The assembly is manufactured to OEM specifications and uses a copper case with wax compound for responsive temperature control in the coolant circuit. It is a direct-fit cooling system service part for applications such as Nissan Frontier, Nissan Xterra, Nissan Pathfinder, Nissan NV1500, Nissan NV2500, Nissan NV3500, Suzuki Equator, and INFINITI M35. If you are replacing a worn thermostat housing on a Nissan Frontier or Nissan Xterra, this 391-180 assembly provides the thermostat and housing in one serviceable unit.

This part cross-references Dayco 85067 for the same application.

Common Problems This Part Can Address

• Engine running too cool or too hot due to thermostat control issues
• Coolant leaks at the housing or gasket interface
• Delayed coolant warm-up after cold starts
• Temperature fluctuation from a sticking thermostat
• Service issues caused by a damaged integrated housing

Installation Notes and Tips

Verify the OE specified 180°F temperature rating before installation. Inspect the mating surfaces, replace old coolant as needed, and confirm the bleeder hole and jiggle pin are positioned correctly during fill and bleed procedures. This assembly is listed for upper position on select Nissan NV2500 applications and N/A position on other listed vehicles, so match the vehicle-specific fitment notes before service.

Quality Assurance

Manufactured by Motorad with OEM-quality materials and safety standards by an OE supplier. Built to OEM specifications and processes for use in demanding automotive cooling systems.

Vehicle Fitment

• Fits 2012-2021 Nissan NV1500, N/A
• Fits 2019-2021 Nissan NV2500, Upper
• Fits 2012-2021 Nissan NV3500, N/A
• Fits 2005-2019 Nissan Frontier, N/A
• Fits 2012-2018 Nissan NV2500, N/A
• Fits 2005-2015 Nissan Xterra, N/A
• Fits 2005-2012 Nissan Pathfinder, N/A
• Fits 2009-2012 Suzuki Equator, N/A
• Fits 2006-2008 INFINITI M35, N/A