Four Seasons 86313 Engine Coolant Thermostat Housing

Thermostat Housing for BMW Cooling Repair

Four Seasons 86313 is an integrated engine coolant thermostat housing built for BMW cooling system service. It combines the thermostat and housing in one assembly, uses plastic construction, and meets or exceeds OEM requirements for direct-fit replacement on select BMW X3 and X4 applications.

The Four Seasons Thermostat Housing line focuses on engine coolant components that restore proper coolant flow control and housing integrity. Part number 86313 is an OE-style replacement for BMW X3 and BMW X4 models that use an integrated thermostat housing design.

Key Features

• Integrated thermostat housing design with thermostat included
• Plastic housing construction
• Gasket or seal not included
• Meets or exceeds OEM specifications
• Inlet port diameter: 1.51 in. / 1.536 in.
• Overall height: 5.72 in. / 5.750 in.
• Flange thickness: 0.630 in.
• Bolt hole center to bolt hole center: 0.91 in.

Detailed Description

Four Seasons 86313 is an engine coolant thermostat housing assembly for vehicles that use an integrated thermostat and housing layout. It is built from plastic and includes the thermostat, making it a direct replacement for cooling system repairs where the original housing has cracked, warped, or begun leaking. This part cross-references Genuine 11537586784 for the same application. It is listed for 2011-2017 BMW X3, 2015 BMW X4, 2016-2017 BMW X4, and 2018 BMW X4, with N/A position fitment.

Common Repair Uses

• Coolant leaks at the thermostat housing
• Overheating caused by thermostat or housing failure
• Cracked or warped plastic coolant component
• Temperature regulation issues from a worn thermostat assembly
• Cooling system service on BMW X3 and BMW X4 models

Installation Notes and Tips

Inspect the mating surfaces, coolant hoses, and adjacent plastic fittings before installation. Because the gasket or seal is not included, verify the required sealing components for your application before assembly. Follow the vehicle service procedure for coolant draining, refill, and air bleeding after installation to restore proper cooling system operation.

Quality Assurance

Four Seasons 86313 is engineered to meet or exceed OEM requirements for the listed BMW applications. Confirm fitment against the vehicle year, model, and cooling system configuration before ordering.