Dorman 904-387 Diesel Exhaust Fluid (DEF) Heater

Overview of Dorman Diesel Exhaust Fluid Heater 904-387

The Dorman 904-387 Diesel Exhaust Fluid (DEF) Heater is designed specifically for select Chevrolet and GMC diesel vans. This component ensures proper DEF temperature regulation to maintain emission system efficiency in cold conditions.

• Compatible with Chevrolet Express 2500, Express 3500, GMC Savana 2500, and Savana 3500
• Includes one diesel emissions fluid heater and one coupler
• Black plastic housing and hose fitting materials for durability
• Specific fitment with male and female hose end fittings
• Equipped with two electrical connectors and six terminals for secure connections
• Mounting hardware included for straightforward installation
• Hose inner lining and outer jacket made of plastic, 85 mm hose length
• Height of 241 mm and hose inside diameter of 115 mm

Detailed Product Description

The Dorman 904-387 DEF Heater is engineered to maintain the diesel exhaust fluid at optimal temperatures, preventing freezing and ensuring consistent flow in emission control systems. Its black plastic housing and hose fittings provide resistance to corrosion and wear, suitable for the demanding environments of Chevrolet Express and GMC Savana diesel vans. The heater features a resistor-type level sensor and comes with two electrical connectors (male and female) with six terminals, facilitating reliable electrical integration. The hose ends are male fittings, designed for specific vehicle applications, ensuring a precise and secure connection. This part includes mounting hardware and a coupler, streamlining the replacement process.

Common Applications and Problem Solving

• Prevents DEF freezing in cold weather conditions
• Maintains proper DEF flow to the emission system
• Reduces risk of emission system faults related to DEF temperature
• Helps avoid engine derate caused by DEF system errors
• Supports compliance with emission regulations by ensuring DEF system functionality

Installation Notes and Tips

• Designed for specific fitment on Chevrolet Express 2500/3500 and GMC Savana 2500/3500 models
• Includes mounting hardware and coupler for ease of installation
• Ensure electrical connectors are properly matched (male/female) and terminals securely connected
• Verify hose fittings are correctly oriented (male ends) to prevent leaks
• Follow vehicle manufacturer guidelines for DEF system maintenance during installation

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 904-387 DEF Heater undergoes quality checks to ensure durability and reliable operation within the emission control system. Warranty coverage details should be confirmed with the point of purchase or vehicle manufacturer, as they may vary.