Dorman 604-337 HVAC Blend Door Actuator - Main

HVAC Blend Door Actuator for Lexus and Toyota

Dorman 604-337 is a rotary HVAC blend door actuator built to match the fit and function of the original heater blend door actuator on select Lexus and Toyota applications. It is engineered for the main recirculation position on 2003-2009 Lexus GX470 and 2003-2009 Toyota 4Runner models.

• Rotary switch activation type for HVAC door control
• 5 blade terminals with male terminal design
• Plastic housing construction
• Direct replacement for the main recirculation actuator location
• Fits 2003-2009 Lexus GX470, Main
• Fits 2003-2009 Toyota 4Runner, Main

Detailed Product Overview

This HVAC blend door actuator helps control air distribution inside the climate system by moving the blend or recirculation door to the requested position. Dorman 604-337 is designed as an OE-style replacement for the original actuator used in the main recirculation position on Lexus GX470 and Toyota 4Runner vehicles from 2003 through 2009. The part number 604-337 is a direct reference for shoppers searching for a replacement HVAC heater blend door actuator for these applications.

This part cross-references 8710635150 for the same application.

Common Problems This Part Can Address

• Incorrect cabin air recirculation control
• HVAC doors that stop responding to temperature or airflow commands
• Clicking or repeated actuator movement from a worn internal gear set
• Inconsistent air distribution through the climate control system
• Loss of proper blend door positioning in the main HVAC case

Installation Notes and Tips

Verify the connector style, terminal count, and actuator position before installation. This unit uses a rotary activation design with 5 male blade terminals and a plastic housing, so matching the original electrical and mounting configuration is important for proper operation. Confirm the application against the vehicle year, make, model, and main recirculation location before replacing the original actuator.

Quality Assurance

Dorman states that this HVAC heater blend door actuator is precision-engineered to match the quality and performance of the original part on specific vehicle years, makes, and models. The Dorman 604-337 is built as a replacement for select Lexus GX470 and Toyota 4Runner HVAC systems.