Dorman 902-817 Engine Coolant Thermostat Housing Assembly - Water Pump

Engine Coolant Thermostat Housing for BMW

Dorman 902-817 is an engine coolant thermostat housing assembly built for BMW cooling system service. It matches the fit and durability of the original housing on specified vehicles and uses aluminum construction to handle repeated temperature swings in demanding engine bay conditions.

Compatible With BMW M2, M3, M4, M5, M6, M8, X3, X4, X5, X6, 650i, 750i, and related applications with a water pump-mounted thermostat housing. The Dorman 902-817 thermostat housing assembly is a direct-fit replacement for BMW cooling repairs where the housing, thermostat, and sensor interface need to be restored together.

Key Features

• Aluminum housing with a natural finish
• Integrated thermostat included
• Gasket included for sealing at installation
• One outlet port and three mounting holes
• Thermostat opening temperature: 221 degrees F
• Package contents include thermostat housing assembly and sensor
• Designed for BMW water pump applications with integrated cover notes on select models

Detailed Description

This Dorman thermostat housing assembly is engineered as a replacement for the stock engine coolant thermostat housing on specified BMW vehicles. The aluminum body is built to match OE fit and service requirements, while the included gasket helps create a proper seal during cooling system repair. With the thermostat already included and a 221 degrees F opening temperature, this assembly supports accurate coolant flow control in BMW engines that use a water pump-mounted housing.

Part number 902-817 is listed for a wide range of BMW applications, including BMW X5, BMW X6, BMW M5, and BMW 7 Series models, along with performance variants such as M2, M3, M4, M6, and M8. This part cross-references Beck/Arnley 143-0869 and Continental 49299 for the same application.

Common Repair Uses

• Coolant leaks at the thermostat housing
• Cracked or warped housing from heat cycling
• Faulty thermostat operation affecting engine temperature control
• Cooling system service on BMW water pump-mounted housings
• Sensor-related housing replacement during coolant repair

Installation Notes and Tips

• Verify the vehicle’s year, model, and water pump housing configuration before ordering.
• Inspect the mating surface and replace worn seals or damaged components during installation.
• Bleeder hole is not provided on this housing.
• Mounting hardware is not included.
• Use the included gasket and sensor as part of a complete cooling system repair.

Quality Assurance

Dorman designs this replacement thermostat housing assembly to match the fit and durability of the original BMW part. The aluminum construction and OE-style configuration support reliable service in high-temperature cooling system environments.