Dorman 904-385 Diesel Exhaust Fluid (DEF) Heater

Overview of Dorman 904-385 Diesel Exhaust Fluid Heater

The Dorman 904-385 Diesel Exhaust Fluid (DEF) Heater is designed specifically for BMW X5 models to ensure optimal DEF system performance in cold conditions. This DEF heater helps maintain fluid temperature, preventing crystallization and ensuring proper emission control system operation.

• Compatible with BMW X5 diesel models
• Specific fit for precise installation
• Plastic black housing for durability
• Includes mounting hardware for easy setup
• Dual electrical connectors with male and female terminals
• Resistor-type level sensor integration
• Inlet and outlet female fittings
• Wire insulation made of plastic with multiple wire colors
• Height dimension: 178 mm, inside diameter: 115 mm

Detailed Product Description

The Dorman 904-385 DEF heater is engineered to maintain the temperature of diesel exhaust fluid in BMW X5 vehicles, preventing freezing and ensuring consistent DEF flow. The heater features a durable black plastic housing and comes with mounting hardware for a secure fit. It includes two electrical connectors with both male and female terminals, supporting three to four terminal connections, which facilitates reliable electrical integration. The inlet and outlet fittings are female type, designed for compatibility with the vehicle’s DEF system plumbing. The resistor-type level sensor helps monitor fluid levels accurately. Wiring is insulated with plastic and color-coded in black, white, yellow, blue, red, and gray for straightforward installation and troubleshooting.

Common Applications and Issues Addressed

• Prevents DEF freezing in cold weather conditions
• Ensures proper DEF flow to the emission control system
• Helps maintain compliance with emission regulations
• Reduces risk of DEF crystallization and clogging
• Supports reliable operation of BMW X5 diesel exhaust systems

Installation Notes and Tips

• Designed for specific fitment on BMW X5 diesel models; verify compatibility before installation
• Includes mounting hardware for secure attachment; use recommended tools for installation
• Check electrical connector terminals for proper male/female alignment
• Ensure inlet and outlet fittings are properly connected to avoid leaks
• Follow vehicle manufacturer guidelines for DEF system maintenance

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards, providing reliable performance for emission control components. The 904-385 DEF heater undergoes quality checks to ensure durability and proper function. Warranty coverage details should be confirmed with the product documentation or supplier.