Dorman 904-375 Diesel Exhaust Fluid (DEF) Heater

Overview of Dorman Diesel Exhaust Fluid Heater 904-375

The Dorman 904-375 Diesel Exhaust Fluid (DEF) Heater is designed specifically for select Mercedes-Benz models, including the ML320, ML350, and ML400. This DEF heater ensures optimal fluid temperature for efficient emission control in colder climates.

• Inside diameter options: 115 mm and 4.375 inches
• Includes two electrical connectors with seven terminals (male and female)
• Durable black plastic housing
• Female inlet and outlet fittings for secure connections
• Resistor-type level sensor integrated
• Mounting hardware included for straightforward installation
• Wire insulation made of plastic with multiple wire colors for easy identification

Detailed Product Description

The Dorman 904-375 DEF heater is engineered to maintain the proper temperature of diesel exhaust fluid, preventing freezing and ensuring consistent flow in emission systems. Its specific fitment for Mercedes-Benz ML320, ML350, and ML400 models guarantees compatibility and reliable performance. The heater features a robust plastic housing in black, designed to withstand harsh under-hood conditions. With two electrical connectors and seven terminals, the unit supports secure and efficient electrical connections. The resistor-type level sensor provides accurate fluid level monitoring, while the female inlet and outlet fittings facilitate easy integration with existing DEF lines. The package includes all necessary mounting hardware, simplifying the installation process.

Common Applications and Issues Addressed

• Prevents DEF freezing in cold weather conditions
• Ensures proper DEF flow to the emission system
• Maintains emission control system efficiency
• Reduces risk of engine derate due to DEF system faults
• Supports compliance with emission regulations for Mercedes-Benz ML320, ML350, and ML400

Installation Notes and Tips

Installation of the Dorman 904-375 DEF heater requires attention to the specific electrical connectors and fittings. Ensure the male and female connectors are properly matched and securely fastened. Use the included mounting hardware to firmly attach the heater in the designated location. Verify that the resistor-type level sensor is correctly positioned for accurate fluid level readings. It is recommended to inspect wiring insulation and connections for any damage before installation. This part is designed for specific fitment on Mercedes-Benz ML320, ML350, and ML400 models, so confirm vehicle compatibility prior to installation.

Quality Assurance and Warranty

Dorman manufactures the 904-375 DEF heater to meet or exceed OEM standards for emission control components. The plastic housing and electrical connectors are built for durability and long service life. This part comes with mounting hardware to ensure a secure fit. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship. Always refer to the product documentation or contact the supplier for exact warranty terms.