Dorman 604-278 HVAC Blend Door Actuator - Auxiliary or Floor Console

HVAC Blend Door Actuator for Ford and Lincoln

The Dorman 604-278 HVAC blend door actuator is built for specific Ford and Lincoln applications where precise air door movement is needed for proper cabin temperature control. It uses a rotary switch activation design and a plastic housing to match the original actuator style on supported vehicles.

Compatible With 2002-2004 Ford Expedition, auxiliary; 2002-2004 Lincoln Navigator, auxiliary; and 2002-2003 Lincoln Blackwood, floor console.

Key Features

• HVAC blend door actuator for temperature and airflow control
• Rotary switch activation type for the specified vehicle applications
• Plastic construction for OE-style fit and function
• Direct replacement for the original air door actuator on listed Ford and Lincoln models
• Part number 604-278 for easy identification

Detailed Description

Dorman 604-278 is a heater blend door actuator engineered to match the quality and performance of the original unit on specific vehicle years, makes, and models. It is used in HVAC systems to move the blend door or air door so the system can regulate cabin air temperature and distribution. This part cross-references Dayco 73049 for the same application.

For fitment-focused searches, this actuator is a direct option for 2002-2004 Ford Expedition auxiliary HVAC service, 2002-2004 Lincoln Navigator auxiliary HVAC service, and 2002-2003 Lincoln Blackwood floor console applications. If you are replacing a failed 604-278 actuator, confirm the position and shaft style before installation.

Common Issues This Part May Address

• Inconsistent cabin temperature from the HVAC vents
• Air stuck on hot or cold settings
• Blend door movement that is slow, noisy, or unresponsive
• Improper airflow routing in the auxiliary or floor console HVAC system
• HVAC control problems caused by a worn actuator motor or internal gears

Installation Notes and Tips

Verify the vehicle year, make, model, and HVAC position before ordering. This part is listed for auxiliary and floor console locations only, with notes that include D-shaped shaft and mode-specific applications on certain Ford Expedition, Lincoln Navigator, and Lincoln Blackwood vehicles. Compare the original actuator connector, shaft interface, and mounting location to the replacement part before installation.

Quality Assurance

Dorman manufactures this blend door actuator as a precision-engineered replacement for the original component on the listed applications. The design focus is OE-style fit and performance for supported Ford and Lincoln HVAC systems.