Dorman 902-5121 Engine Coolant Thermostat Housing

Overview of Dorman Engine Coolant Thermostat Housing 902-5121

The Dorman 902-5121 engine coolant thermostat housing is designed for reliable cooling system performance in select BMW models. Crafted from durable metal with a natural finish, this thermostat housing ensures proper coolant flow and engine temperature regulation for vehicles like the BMW 325e, 325i, 325iX, 525i, and 528e.

• Constructed from sturdy metal material for durability
• Natural color finish matching OEM appearance
• Outlet port diameter of 1.467 inches for precise coolant flow
• Height measures 2.625 inches for accurate fitment
• Includes three mounting holes with diameters of 0.27 inches
• Multiple bolt hole center-to-center measurements: 2.02, 2.325, and 2.54 inches
• Flange thickness of 0.565 inches for secure sealing
• Does not include gasket, bolts, O-rings, or thermostat
• Package contains one thermostat housing unit

Detailed Product Description

The Dorman 902-5121 engine coolant thermostat housing is engineered to meet the specifications required by BMW vehicles such as the 325e, 325i, 325iX, 525i, and 528e. Its metal construction provides strength and resistance to heat and corrosion, essential for maintaining the integrity of the cooling system. The natural finish preserves the original equipment look, while the precise outlet port diameter of 1.467 inches ensures consistent coolant flow. The housing’s height of 2.625 inches and flange thickness of 0.565 inches are designed to fit securely and maintain a tight seal when installed with the appropriate gasket and hardware (not included). The three mounting holes with varied bolt hole center-to-center distances allow for proper alignment and secure attachment to the engine block.

Compatible Vehicles and Common Applications

• Compatible with BMW 325e, 325i, 325iX, 525i, and 528e models
• Used to house the engine coolant thermostat (thermostat not included)
• Replaces worn or damaged thermostat housings to prevent coolant leaks
• Helps maintain optimal engine operating temperature
• Addresses issues such as coolant leaks, overheating, and thermostat housing cracks

Installation Notes and Tips

When installing the Dorman 902-5121 thermostat housing, ensure the use of a compatible gasket or seal to prevent leaks, as this product does not include one. Verify bolt hole alignment using the provided center-to-center measurements (2.02, 2.325, and 2.54 inches) to ensure proper fitment. Use appropriate torque specifications for mounting bolts to avoid damage to the housing or engine block. Since bolts and O-rings are not included, source OEM or equivalent parts for installation. Inspect the thermostat separately and replace if necessary, as this housing does not come with a thermostat.

Quality Assurance and Warranty

Dorman manufactures the 902-5121 thermostat housing to meet or exceed OEM standards for fit, form, and function. The metal construction is designed for durability and resistance to typical engine bay conditions. While this product does not include a thermostat or mounting hardware, it is backed by Dorman’s quality control processes. Please refer to Dorman’s official warranty policy for specific coverage details.