Beck Arnley 143-0721 Engine Coolant Thermostat

Engine Cooling Thermostat for Nissan and INFINITI

Beck Arnley 143-0721 is an engine coolant thermostat built to match foreign nameplate OE specifications for form, fit, and function. It is set to 180 degrees and is a direct choice for drivers servicing Nissan Frontier, Xterra, Pathfinder, Quest, and related INFINITI applications.

Use this Beck Arnley thermostat when you need a precise replacement for temperature control in the cooling system. The housing is not included, and gasket/seal is not included, so verify your service parts before installation.

Key Features

• 180-degree engine coolant thermostat
• OE-style fit and function for foreign nameplate applications
• Housing not included
• Gasket/seal not included
• Beck Arnley part number 143-0721

Detailed Product Information

Beck Arnley 143-0721 is engineered for Nissan and INFINITI cooling system service where original equipment temperature control is required. It is listed for 1999-2004 Nissan Frontier, 2000-2004 Nissan Xterra, 1993-2002 Nissan Quest, 1997-2001 INFINITI Q45, 1997-2000 INFINITI QX4, and 1996-2000 Nissan Pathfinder with original equipment temperature notes. Additional coverage includes alternate-temperature applications such as 1984-1996 Nissan 300ZX, 1987-1995 Nissan Pathfinder, 1995 Nissan Pickup, 1986-1994 Nissan D21, 1985-1994 Nissan Maxima, 1990-1992 INFINITI M30, and 1987-1988 Nissan 200SX.

This thermostat cross-references common OE-style cooling service needs for Nissan Frontier thermostat replacement, Nissan Xterra thermostat replacement, and INFINITI QX4 coolant temperature control service. Part number 143-0721 is a practical match when restoring stable engine operating temperature.

What It Helps Address

• Engine running too cool or too hot
• Delayed warm-up after startup
• Temperature fluctuation during driving
• Cooling system service on Nissan and INFINITI vehicles
• Replacement of a worn or sticking thermostat

Installation Notes and Tips

Confirm the 180-degree temperature specification before installation. Housing is not included, and gasket/seal is not included, so inspect the thermostat housing and sealing surfaces for wear, corrosion, or damage. Clean the mating surfaces thoroughly and follow the vehicle service procedure for coolant refill and air bleeding. For J30 applications, sealant is required per the fitment notes.

Quality Assurance

Beck Arnley sources parts to meet foreign nameplate OE specifications for form, fit, and function. Product specialists work with global sourcing partners to support accurate replacement selection for Nissan and INFINITI cooling system repairs.