Dorman 902-5900 Engine Coolant Thermostat Housing

Overview of Dorman Engine Coolant Thermostat Housing 902-5900

The Dorman 902-5900 engine coolant thermostat housing is designed for reliable cooling system performance in select INFINITI and Nissan vehicles. This black plastic housing provides a precise fit for models such as the Armada, FX45, M45, NV2500, NV3500, Pathfinder, Q45, QX56, and TITAN.

• Durable black plastic construction
• Outlet port diameter of 1.5 inches for proper coolant flow
• Three mounting holes with 0.313 inch diameter for secure installation
• 30-degree housing neck angle to match OEM specifications
• Includes thermostat housing only; thermostat and gasket not included

Detailed Product Description

The Dorman 902-5900 thermostat housing is engineered to meet the exact specifications required by various INFINITI and Nissan models. Constructed from high-quality plastic, it offers resistance to corrosion and heat, ensuring long-term durability within the engine cooling system. The housing features a 1.5-inch outlet port diameter, facilitating efficient coolant circulation. Its three mounting holes, each measuring 0.313 inches in diameter, allow for a secure and stable fit. The 30-degree housing neck angle aligns with factory design to maintain proper hose connection and coolant flow. This part does not include a thermostat, gasket, bolts, or air vent, so those components must be sourced separately if needed.

Compatible Vehicles and Applications

This engine coolant thermostat housing is compatible with the following vehicles:

• INFINITI Armada, FX45, M45, Q45, QX56
• Nissan NV2500, NV3500, Pathfinder, Pathfinder Armada, TITAN

It is intended for use in cooling system repairs where the thermostat housing is damaged, cracked, or leaking, helping to restore proper engine temperature regulation.

Common Issues Addressed by This Thermostat Housing

• Coolant leaks caused by cracked or warped thermostat housing
• Overheating due to improper coolant flow
• Loose or damaged mounting points affecting housing stability
• Corrosion-related failures in older plastic housings
• Replacement during cooling system maintenance or upgrades

Installation Notes and Tips

• Ensure the engine is cool before beginning installation to avoid burns
• Inspect and replace the thermostat and gasket separately, as they are not included
• Use appropriate torque specifications for the three mounting bolts to prevent damage
• Check hose connections for proper fit and secure clamps
• Flush the cooling system if contamination or debris is present before installation

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit and function. The 902-5900 thermostat housing undergoes rigorous quality control to ensure durability and performance. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in material and workmanship. Consult product documentation or the manufacturer for exact warranty terms.