Dorman 902-5909 Automatic Transmission Oil Cooler Thermostat - To Radiator

Overview of Dorman Automatic Transmission Oil Cooler Thermostat

The Dorman 902-5909 automatic transmission oil cooler thermostat is designed specifically for BMW X3 models. This thermostat helps regulate transmission fluid temperature to maintain optimal performance and protect your vehicle's transmission system.

• Material: Durable black plastic construction
• Opening temperature: 185°F for precise temperature control
• Includes thermostat housing, thermostat, and 2 o-rings for a complete replacement
• Single port design with 1.875 inch outside diameter
• Overall length of 2.8125 inches for exact fitment
• Thermostat included for immediate installation

Detailed Product Description

The Dorman 902-5909 automatic transmission oil cooler thermostat is engineered to maintain the proper operating temperature of the transmission fluid in BMW X3 vehicles. Constructed from high-quality black plastic, this thermostat features a single port with a 1.875 inch outside diameter and an overall length of 2.8125 inches, ensuring a precise fit. The thermostat opens at 185 degrees Fahrenheit, allowing transmission fluid to flow through the cooler only when necessary, which helps prevent overheating and excessive wear.

This product includes the thermostat housing, the thermostat itself, and two o-rings to ensure a secure and leak-free installation. Designed for compatibility with BMW X3 models, the Dorman 902-5909 helps maintain transmission efficiency and longevity by regulating fluid temperature effectively.

Common Applications and Issues Addressed

• Prevents transmission fluid overheating in BMW X3 vehicles
• Helps avoid transmission slippage caused by improper fluid temperature
• Reduces risk of premature transmission wear due to thermal stress
• Eliminates leaks by replacing worn thermostat housing and o-rings
• Restores proper fluid flow through the transmission cooler

Installation Notes and Tips

• Ensure the vehicle is cool before beginning installation to avoid burns
• Replace both the thermostat and housing together for best results
• Use the included o-rings to prevent leaks and ensure a tight seal
• Verify the opening temperature matches vehicle specifications (185°F)
• Consult the BMW X3 service manual for torque specifications and detailed procedures

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 902-5909 automatic transmission oil cooler thermostat undergoes rigorous quality control to ensure durability and reliable performance. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in material and workmanship. Refer to Dorman's official warranty policy for complete information.