Dorman 604-879 HVAC Blend Door Actuator - Main

Dorman 604-879 HVAC Blend Door Actuator

Dorman 604-879 is an HVAC heater blend door actuator built for specific Acura CSX and Honda Civic applications. It is precision-engineered to match the quality and performance of the original blend door actuator, helping restore proper HVAC mode selection and temperature control.

• Rotary switch activation type for HVAC blend door operation
• 7-pin male terminal design
• Plastic housing for OE-style fit and function
• Direct replacement for select Acura CSX and Honda Civic models
• Cross-references Dorman 604-879 with 79140SNAA01 and APBDA0225 for the same application

Detailed Product Overview

This HVAC blend door actuator is used in the heater and air distribution system to move the blend door and support correct airflow routing. For 2006-2011 Honda Civic, Main position applications and 2006-2011 Acura CSX, Main position applications, Dorman 604-879 is built to match the original actuator’s electrical and mechanical layout. The rotary activation style, pin terminals, and 7-terminal male connector help maintain proper interface with the vehicle’s HVAC control system.

Use Dorman 604-879 when replacing a worn or failed actuator on a Honda Civic or Acura CSX with symptoms tied to inconsistent vent selection or temperature blend control. The part number 604-879 is a direct-fit replacement for the listed vehicles and positions.

Common Issues This Part May Resolve

• HVAC vents stuck on one airflow mode
• Inconsistent cabin temperature blending
• Clicking or repeated movement from a failing actuator
• Loss of response when changing mode or temperature settings
• Air distribution not matching the selected HVAC control setting

Installation Notes and Tips

Verify the vehicle year, make, model, and Main position before installation. Compare the connector style, terminal count, and actuator shape to the original unit to confirm a proper match. After installation, cycle the HVAC controls to confirm smooth blend door movement and correct mode selection. For 2006-2011 Honda Civic and 2006-2011 Acura CSX applications, Dorman 604-879 should be checked against the original part number and connector configuration before replacement.

Quality Assurance

Dorman designs this actuator as an OE-style replacement for specific vehicle applications, with engineering focused on matching original fit and performance. The part number 604-879 is supported by Dorman’s application-specific replacement approach for HVAC repair.