Dorman 902-5955 Engine Coolant Thermostat Housing Assembly - Auxiliary

Overview of Dorman Engine Coolant Thermostat Housing Assembly

The Dorman 902-5955 Engine Coolant Thermostat Housing Assembly is designed specifically for BMW 540i, 740i, and 740iL models. This assembly includes a thermostat calibrated to open at 176 degrees Fahrenheit, ensuring precise engine temperature regulation for optimal performance.

• Material: Durable black plastic construction
• Includes thermostat with 176°F opening temperature
• Inside diameter measures 0.772 inches for proper coolant flow
• Features four outlet ports for efficient coolant distribution
• Two mounting holes with 2.754-inch center-to-center spacing
• Flange dimensions: 1.59 inches length, 1.063 inches width, 0.396 inches thickness
• Package contains one thermostat and one thermostat housing

Detailed Product Description

This engine coolant thermostat housing assembly from Dorman is engineered to meet the cooling system requirements of select BMW vehicles, including the 540i, 740i, and 740iL. Constructed from high-quality plastic, the housing offers resistance to corrosion and heat, contributing to long-term durability. The included thermostat opens at 176 degrees Fahrenheit, helping maintain the engine within its optimal operating temperature range. The housing features four outlet ports to facilitate effective coolant flow and heat dissipation. With two mounting holes spaced 2.754 inches apart, installation aligns with factory specifications. The flange dimensions ensure a secure and proper fit, minimizing the risk of leaks or coolant loss.

Common Applications and Problem Resolution

• Replacement for faulty or leaking thermostat housing assemblies on BMW 540i, 740i, and 740iL
• Resolves engine overheating caused by thermostat failure
• Addresses coolant leaks due to cracked or damaged housing
• Improves coolant flow and temperature regulation in aging cooling systems
• Prevents engine damage related to improper thermostat operation

Installation Notes and Tips

Ensure the engine is cool before beginning installation to avoid burns from hot coolant. This assembly does not include mounting hardware or gaskets, so reuse existing components if in good condition or acquire replacements separately. Verify the mounting hole alignment and flange fit to prevent leaks. Properly torque mounting bolts to manufacturer specifications. After installation, refill and bleed the cooling system to remove air pockets and verify proper operation.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 902-5955 thermostat housing assembly undergoes quality checks to ensure reliable performance in BMW 540i, 740i, and 740iL models. While specific warranty details are not provided, Dorman typically offers limited warranties covering defects in material and workmanship.