Dorman 902-5825 Engine Coolant Thermostat Housing Assembly

Overview of Dorman Engine Coolant Thermostat Housing Assembly

The Dorman 902-5825 Engine Coolant Thermostat Housing Assembly is designed to regulate engine temperature efficiently in select BMW models. This assembly includes a thermostat calibrated to open at 217 degrees Fahrenheit, ensuring optimal engine performance and temperature control.

• Material: Durable black plastic construction
• Thermostat opening temperature: 217°F for precise temperature regulation
• Includes one thermostat housing, one thermostat, and one sensor
• Single outlet port design for streamlined coolant flow
• Standard gasket type included (gasket or seal not separately included)
• Compatible with multiple BMW models including 335i, 435i, M2, and X5

Detailed Product Description

The Dorman 902-5825 thermostat housing assembly is engineered from high-quality plastic to provide reliable service in the cooling system of BMW vehicles. It features multiple inside diameters (0.7, 0.82, and 1.3 inches) to accommodate precise coolant flow requirements. The assembly includes a thermostat that opens at 217 degrees Fahrenheit, helping maintain the engine within the optimal temperature range. This part is designed without mounting hardware and does not include a bleeder hole, focusing on a straightforward replacement for compatible BMW models.

Compatible BMW Models and Applications

This thermostat housing assembly is compatible with a range of BMW vehicles, including but not limited to:

• BMW 235i and M235i (including xDrive variants)
• BMW 335i, 335i GT xDrive, and 335i xDrive
• BMW 435i, 435i Gran Coupe, 435i xDrive, and 435i xDrive Gran Coupe
• BMW ActiveHybrid 3
• BMW M2 and M135i
• BMW X5 and X6 SUVs

Common Issues Addressed by This Thermostat Housing Assembly

• Engine overheating due to thermostat failure
• Coolant leaks from damaged or cracked thermostat housing
• Erratic engine temperature readings caused by faulty thermostat
• Reduced engine efficiency from improper coolant flow
• Replacement of worn or degraded thermostat components

Installation Notes and Tips

When installing the Dorman 902-5825 thermostat housing assembly, ensure the engine is cool before beginning work. Properly drain the coolant system to avoid spills. Since mounting hardware is not included, retain original fasteners or source appropriate replacements. Verify the thermostat orientation and seating to prevent leaks. After installation, refill the cooling system and bleed air pockets to maintain optimal performance.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM specifications for fit and function. The 902-5825 thermostat housing assembly undergoes rigorous quality control to ensure durability and reliable operation in BMW cooling systems. While specific warranty details are not provided here, Dorman typically offers limited warranties covering defects in material and workmanship.