Dorman 902-5908 Automatic Transmission Oil Cooler Thermostat

Overview of Dorman Automatic Transmission Oil Cooler Thermostat

The Dorman 902-5908 automatic transmission oil cooler thermostat is designed to regulate transmission fluid temperature efficiently. Engineered with durable plastic material, this thermostat is compatible with various BMW models, ensuring optimal transmission performance and longevity.

• Constructed from durable black plastic for corrosion resistance
• Opens at 180°F to maintain ideal transmission fluid temperature
• Features two ports with outside diameters of 0.325 and 0.5 inches
• Compact overall length of 4.2 inches for precise fitment
• Includes transmission thermostat housing and thermostat in package

Detailed Product Description

The Dorman 902-5908 automatic transmission oil cooler thermostat is a critical component for maintaining proper transmission fluid temperature in select BMW vehicles. Its plastic construction offers resistance to corrosion and heat, while the thermostat opens at 180 degrees Fahrenheit to allow fluid flow through the cooler when necessary. The unit features two ports with different outside diameters (0.325 and 0.5 inches), designed to fit specific transmission cooling lines. With an overall length of 4.2 inches, this thermostat ensures a precise fit within the transmission cooling system. This part is compatible with BMW models including 525i, 525xi, 528i, 528xi, 530i, 530xi, 545i, 550i, 645Ci, 650i, 745i, 745Li, 750i, 750Li, 760i, and 760Li.

Compatible BMW Models and Applications

This automatic transmission oil cooler thermostat is compatible with a range of BMW vehicles, specifically:

• BMW 525i and 525xi
• BMW 528i and 528xi
• BMW 530i and 530xi
• BMW 545i and 550i
• BMW 645Ci and 650i
• BMW 745i and 745Li
• BMW 750i and 750Li
• BMW 760i and 760Li

Common Issues Addressed by This Thermostat

• Prevents transmission fluid overheating by regulating flow to the cooler
• Helps avoid premature transmission wear caused by excessive heat
• Maintains optimal transmission operating temperature for smooth shifting
• Reduces risk of transmission fluid breakdown and contamination
• Supports efficient transmission cooling system performance

Installation Notes and Tips

• Ensure vehicle is cool before beginning installation to avoid burns
• Verify port sizes and orientation match existing transmission lines
• Replace any worn or damaged seals during installation to prevent leaks
• Follow manufacturer torque specifications for mounting hardware
• Test transmission fluid temperature after installation to confirm proper operation

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 902-5908 automatic transmission oil cooler thermostat undergoes rigorous quality control to ensure reliable performance. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in material and workmanship. Consult product documentation for exact warranty terms.