Dorman 902-5123 Engine Coolant Thermostat Housing - Outer

Overview of Dorman Engine Coolant Thermostat Housing 902-5123

The Dorman 902-5123 engine coolant thermostat housing is designed for reliable cooling system performance in select Lexus and Toyota vehicles. This black plastic housing provides a precise fit for the Lexus RX330 and Toyota Sienna models, ensuring proper coolant flow and engine temperature regulation.

• Constructed from durable black plastic for corrosion resistance
• Includes one thermostat housing without gasket or thermostat
• Features dual outlet port diameters of 1.43 and 2.0 inches
• Mounting hole quantity: 3 with diameters of 0.29 and 0.37 inches
• Flange thickness of 0.3 inches and housing neck angle of 90 degrees
• Compatible with Lexus RX330 and Toyota Sienna cooling systems

Detailed Product Description

The Dorman 902-5123 thermostat housing is engineered to meet the exact specifications required for the Lexus RX330 and Toyota Sienna models. Made from high-quality plastic, this housing resists corrosion and withstands the thermal stresses of engine operation. It features two outlet ports with diameters of 1.43 and 2.0 inches, allowing for proper coolant routing. The housing includes three mounting holes with precise spacing (2.2 inches center to center) and diameters (0.29 and 0.37 inches) to ensure secure attachment. The 90-degree housing neck angle facilitates optimal hose connection. Note that this part does not include a thermostat, gasket, bolts, or O-rings, which should be sourced separately.

Compatible Vehicles and Applications

• Designed specifically for Lexus RX330 models
• Compatible with Toyota Sienna vehicles
• Used in engine coolant systems to house the thermostat
• Supports proper engine temperature regulation and coolant flow
• Replaces worn or damaged thermostat housings to prevent leaks and overheating

Installation Notes and Tips

• Ensure the engine is cool before beginning installation
• Inspect and replace the thermostat and gasket separately as needed
• Verify mounting hole alignment and torque bolts to manufacturer specifications
• Check all hose connections for secure fit and no leaks after installation
• Flush cooling system if contamination or corrosion is present

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 902-5123 thermostat housing undergoes quality inspections to ensure durability and performance. While this product does not include a warranty statement in the provided data, Dorman typically offers limited warranties on their replacement parts. Consult Dorman’s official documentation for specific warranty details.