Dorman 604-945 HVAC Blend Door Actuator - Main

HVAC Blend Door Actuator for Lexus Recirculation Control

Dorman 604-945 is an HVAC heater blend door actuator engineered to match the fit and function of the original unit on select Lexus vehicles. It uses a rotary switch activation design and a plastic housing to restore recirculation door movement in the HVAC system.

• Rotary switch activation type for recirculation door control
• Plastic construction for HVAC housing applications
• Direct replacement for select Lexus HVAC blend door actuator locations
• Paraphrased OE-style replacement for factory actuator performance
• Fits Lexus GS300, GS430, GS400, RX300, and SC430 applications listed below

Detailed Product Overview

This Dorman HVAC blend door actuator, part number 604-945, is built for specific Lexus recirculation and blower housing applications where the original actuator controls air door movement inside the HVAC case. It is a direct-fit replacement for select Lexus GS300, GS430, GS400, RX300, and SC430 models, helping restore proper cabin air routing and temperature control behavior. This part cross-references Standard Ignition ADR4264 for the same application.

Compatible With: Fits 2002-2010 Lexus SC430, Main; Fits 1999-2005 Lexus GS300, Main; Fits 2001-2005 Lexus GS430, Main; Fits 1999-2003 Lexus RX300, Main; Fits 1998-2000 Lexus GS400, Main; Fits 1997-1998 Lexus GS300, Main.

Common Problems This Part Can Address

• Recirculation door stuck in one position
• Inconsistent cabin airflow direction
• HVAC system clicking or failing to respond to control input
• Loss of proper air distribution through the heater and A/C system
• Blend door actuator failure in the main HVAC housing

Installation Notes and Tips

Verify the vehicle year, model, and HVAC position before ordering, since fitment varies by Lexus application and production date. Confirm the existing actuator uses a rotary activation design and matches the listed main recirculation or blower housing location. Access to the actuator may require removal of interior trim or HVAC panels depending on the vehicle.

Quality Assurance

Dorman designs this HVAC heater blend door actuator to match the quality and performance of the original part on the listed vehicles. The part number 604-945 is intended as a direct replacement for the specified Lexus applications and is built to OE-style expectations for fit and function.