Dorman 904-376 Diesel Exhaust Fluid (DEF) Heater

Dorman 904-376 DEF Heater Overview

The Dorman 904-376 Diesel Exhaust Fluid (DEF) Heater is a specific-fit emission control replacement for select Chevrolet Express and GMC Savana vans. It addresses a common failure point in the factory DEF heater design caused by fluid intrusion, helping restore DEF system function on affected diesel applications.

Built with a black plastic housing and OE-style electrical connections, this DEF heater is made for direct replacement service on the vehicles listed below. The Dorman 904-376 is a practical option when you need a replacement DEF heater for 2010-2011 Chevrolet Express 2500, 2010-2011 Chevrolet Express 3500, 2010-2011 GMC Savana 2500, or 2010-2011 GMC Savana 3500.

Key Features

• Specific-fit Diesel Exhaust Fluid (DEF) heater for select GM diesel vans
• OE FIX design modifies the factory layout to address a known fluid-intrusion failure point
• Black plastic housing for application-specific replacement service
• Female inlet and outlet fittings
• Resistor-style level sensor
• Includes mounting hardware
• Electrical connector configuration matches the original service style for the application

Detailed Description

Dorman 904-376 is engineered as an OE-style DEF heater replacement for emission control service on select Chevrolet Express and GMC Savana models. The design updates the original heater architecture to improve reliability where the factory unit is known to fail from DEF fluid intrusion. For technicians and owners searching for a replacement DEF heater for 2010-2011 Chevrolet Express 2500 or GMC Savana 3500, this part provides a direct-fit solution for the listed vehicles.

This part cross-references GM 22783124 for the same application. The Dorman 904-376 part number is also useful when searching for a replacement DEF heater assembly by part number during emission system repair.

What It Helps Fix

• DEF heater failure caused by fluid intrusion
• Emission system faults related to DEF temperature control
• Cold-weather DEF system performance issues tied to a failed heater
• Warning lights or diagnostic trouble codes associated with DEF heater malfunction
• Loss of proper DEF system operation on compatible Chevrolet Express and GMC Savana diesel vans

Installation Notes and Tips

Verify vehicle fitment before installation by matching the model year and application listed for Dorman 904-376. Inspect the DEF tank area, electrical connectors, and related emission components for contamination or damage before installing the new heater. Follow factory service procedures for DEF system service, connector engagement, and sealing surfaces to help ensure proper operation after replacement.

Quality Assurance

Dorman OE FIX parts are developed to address known weaknesses in original equipment designs while maintaining application-specific fitment. This replacement DEF heater is built for the listed Chevrolet Express and GMC Savana applications and is intended for emission control repair where the original heater has failed.