Dorman 604-186 HVAC Blend Door Actuator - Auxiliary

Dorman 604-186 HVAC Blend Door Actuator

This Dorman HVAC blend door actuator is built for precise temperature control in the auxiliary HVAC box on select Hummer H2 models. It is engineered to match the fit and operating performance of the original actuator, making it a direct replacement for the factory unit.

Fits 2008-2009 Hummer H2, Auxiliary.

Key Features

• Rotary switch activation for controlled blend door movement
• Plastic housing construction
• Direct replacement for the original HVAC heater blend door actuator
• Designed for the auxiliary temperature control HVAC box on select Hummer H2 applications
• Part number 604-186 for easy identification

Detailed Description

The Dorman 604-186 HVAC blend door actuator is a replacement component for the auxiliary climate control system in 2008-2009 Hummer H2 vehicles. It regulates blend door position so the HVAC system can direct heated or cooled air as commanded by the control head. This part number 604-186 is built to match the original actuator’s quality and performance requirements for the listed application.

For buyers searching for a 2008 Hummer H2 auxiliary blend door actuator, 2009 Hummer H2 HVAC actuator, or Dorman 604-186 replacement, this part provides a direct-fit solution for the specified vehicle years and position. This part cross-references Standard Ignition ADR130 for the same application.

What It Helps Address

• Inconsistent cabin temperature from the auxiliary HVAC system
• Blend door movement that does not respond correctly to control inputs
• Air stuck on hot or cold in the auxiliary temperature control box
• HVAC clicking or actuator-related noise from a worn unit
• Loss of proper air mixing in the auxiliary climate control circuit

Installation Notes and Tips

Verify the vehicle year, make, model, and auxiliary position before installation. Compare the connector style, mounting points, and actuator orientation to the original unit to confirm a proper match. After installation, cycle the HVAC controls to allow the actuator to relearn or recalibrate if required by the vehicle system.

Quality Assurance

Dorman designs this actuator as an OE-style replacement for the listed Hummer H2 application, with attention to fit and functional performance. The rotary activation design and replacement-focused construction support dependable HVAC operation in the auxiliary temperature control system.