Dorman 902-5019 Engine Coolant Thermostat Housing - Upper

Reliable Engine Coolant Thermostat Housing for Mazda Vehicles

The Dorman 902-5019 engine coolant thermostat housing is designed to provide a durable and precise fit for select Mazda models. Engineered from metal with a natural finish, this thermostat housing ensures consistent performance and long-lasting service in your Mazda 323, MX-3, or Protege.

Key Features of Dorman 902-5019 Thermostat Housing

• Constructed from sturdy metal material for durability
• Natural color finish for corrosion resistance
• Includes a gasket for a secure, leak-free seal
• Outlet port diameter measures 1.188 inches for proper coolant flow
• Two mounting holes with 0.313-inch diameter for secure installation
• Housing neck angle set at 15 degrees to match OEM specifications
• Package contains thermostat housing with gasket; thermostat not included

Detailed Description and Specifications

The Dorman 902-5019 thermostat housing is specifically designed to replace the original part on Mazda 323, MX-3, and Protege models. Its metal construction offers enhanced strength and resistance to heat and pressure within the cooling system. The natural finish helps prevent corrosion over time, maintaining the integrity of the housing. The included gasket ensures a tight seal between the housing and engine block, reducing the risk of coolant leaks. With two mounting holes sized at 0.313 inches in diameter, installation aligns precisely with factory mounting points. The outlet port diameter of 1.188 inches supports proper coolant circulation, while the 15-degree housing neck angle matches the original equipment design for optimal hose connection. This part does not include a thermostat or bolts, so those components must be sourced separately if needed.

Common Applications and Problem Resolution

• Replacement for cracked or damaged thermostat housing on Mazda 323, MX-3, and Protege
• Addresses coolant leaks caused by worn or failed housing gaskets
• Restores proper coolant flow to prevent engine overheating
• Eliminates coolant contamination from housing corrosion or deterioration
• Ensures secure mounting to prevent vibration-related failures

Installation Notes and Tips

When installing the Dorman 902-5019 thermostat housing, ensure the mating surfaces are clean and free of old gasket material to achieve a proper seal. Use the included gasket and torque mounting bolts to manufacturer specifications. Since bolts are not included, reuse original hardware or obtain appropriate replacements. Verify the housing neck angle and outlet port diameter match your vehicle’s cooling system hoses for a correct fit. This part is compatible with Mazda 323, MX-3, and Protege models, so confirm your vehicle’s year and engine configuration before installation.

Quality Assurance and Warranty Information

Dorman manufactures this thermostat housing to meet or exceed OEM standards for fit, form, and function. The metal construction and included gasket contribute to reliable cooling system performance. While specific warranty details are not provided here, Dorman typically offers limited warranties on their replacement parts. Consult product documentation or the supplier for exact warranty terms.