Aisin THN-021 Engine Coolant Thermostat Housing Assembly - Upper

Aisin OE Thermostat Housing Assembly

The Aisin THN-021 engine coolant thermostat housing assembly is an OE-engineered replacement built to match original temperature control requirements. It is specified for 82°C operation and is listed for a wide range of Nissan and INFINITI applications, including Nissan Pathfinder, Murano, Maxima, Altima, Quest, Qashqai, 350Z, and INFINITI QX60 and JX35.

Aisin’s Original Equipment Manufacturer line focuses on direct-fit replacement parts that follow factory specifications for temperature and housing design. The THN-021 is a practical choice when you need an OE-style thermostat housing assembly for Nissan Pathfinder cooling system service or a Nissan Murano thermostat housing replacement.

• OE-engineered thermostat housing assembly for factory-style fit and temperature control
• 82°C thermostat specification for listed Nissan and INFINITI applications
• Direct replacement for select 2007-2025 Nissan and INFINITI vehicles
• Cross-references Beck/Arnley 143-0874 and Bosch 15238 for the same application
• Part number THN-021 for ordering and catalog lookup

Detailed Application Coverage

Compatible with 2016-2025 Nissan Pathfinder, 2015-2024 INFINITI QX60, 2015-2024 Nissan Murano, 2015-2023 Nissan Maxima, 2018-2019 Nissan Qashqai, 2007-2018 Nissan Altima, 2015-2017 Nissan Quest, 2013-2014 Nissan Pathfinder, 2015 Nissan Pathfinder, 2009-2014 Nissan Maxima, 2008-2014 Nissan Murano, 2011-2014 Nissan Quest, 2013 INFINITI JX35, and 2007-2008 Nissan 350Z. This Aisin THN-021 thermostat housing assembly is also listed under OE-style references 21200-9HP0A, 21200-JA10A, and THN021.

Common Repair Uses

• Replacing a leaking thermostat housing on a Nissan Pathfinder
• Restoring proper coolant temperature regulation on a Nissan Murano
• Addressing overheating or slow warm-up concerns tied to thermostat housing wear
• Repairing cracked or warped coolant housing surfaces
• Servicing OE-temperature cooling system components on INFINITI QX60 and JX35 models

Installation Notes

Verify engine fitment by year, model, and cooling system configuration before installation. Inspect the mating surfaces, coolant passages, and related hoses for wear or contamination during service. Follow the vehicle manufacturer’s cooling system bleed and refill procedure after installation to help maintain correct operating temperature.

Quality Assurance

Aisin Original Equipment Manufacturer parts are built as exact replacement components with OE temperature specification matching for the listed applications. This supports factory-style cooling system service on Nissan and INFINITI vehicles.