Dorman 904-392 Diesel Exhaust Fluid (DEF) Heater

Reliable Diesel Exhaust Fluid Heater for Ford Super Duty Trucks

The Dorman 904-392 Diesel Exhaust Fluid (DEF) Heater is designed specifically for Ford F-250 Super Duty and F-350 Super Duty models. This DEF heater ensures proper fluid temperature regulation to maintain optimal emission control system performance in cold conditions.

• Inside diameter: 115 mm for precise fitment
• Single electrical connector with 7 terminals (female connector)
• Durable black plastic housing
• Includes mounting hardware for straightforward installation
• Female inlet and outlet fittings for secure connections
• Resistor-type level sensor integrated
• Wire colors: black, white, yellow, blue, red, gray with plastic insulation
• Height: 285 mm
• Specific fit for Ford F-250 and F-350 Super Duty models

Product Details and Specifications

The Dorman 904-392 DEF heater is engineered with a plastic housing that offers durability while maintaining a lightweight design. Its 115 mm inside diameter ensures compatibility with the DEF system components on Ford Super Duty trucks. The heater features a single female electrical connector with seven terminals, designed to interface seamlessly with the vehicle’s wiring harness. The resistor-type level sensor helps monitor fluid levels accurately. Both inlet and outlet fittings are female, facilitating secure hose connections (hose not included). The product comes with mounting hardware to simplify installation and ensure a stable fit within the emission control system.

Compatible Vehicles and Applications

This diesel exhaust fluid heater is compatible with specific Ford models, including:

• Ford F-250 Super Duty
• Ford F-350 Super Duty

It is designed to maintain DEF fluid temperature in cold weather, preventing crystallization and ensuring the emission system operates efficiently.

Common Issues Addressed by the DEF Heater

• Prevents DEF fluid freezing in low temperatures
• Maintains proper DEF fluid flow to the SCR system
• Reduces emission system fault codes related to DEF temperature
• Helps avoid engine derate caused by DEF system malfunctions
• Supports compliance with emission regulations by ensuring DEF system functionality

Installation Notes and Tips

Installation of the Dorman 904-392 DEF heater requires basic mechanical skills and familiarity with the vehicle’s emission control system. The included mounting hardware allows for secure attachment. Ensure electrical connectors are properly aligned and fully seated to avoid connection issues. Since the heater does not include hoses, verify existing DEF lines are compatible with the female inlet and outlet fittings. Always disconnect the battery before installation to prevent electrical shorts.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit and function. The 904-392 DEF heater undergoes quality checks to ensure reliable operation within the emission control system. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in material and workmanship. Refer to the product packaging or manufacturer documentation for exact warranty terms.