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Dorman 604-187 HVAC Blend Door Actuator - MainOE Quality 60-Day Returns
Part #: 604-187

Dorman 604-187 HVAC Blend Door Actuator - Main

Main
15 vehicles fit this part
Select your vehicle to confirm fitment
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OE Direct Replacement — Bolt-on fit, no modifications needed
Fitment: Hummer, Saturn, and Pontiac, H3, H3T, Sky, and Solstice
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HVAC Blend Door Actuator for Select GM Applications

The Dorman 604-187 HVAC blend door actuator is a rotary, plastic replacement part engineered to match the quality and performance of the original actuator on specific vehicle years, makes, and models. It is built for the main HVAC position on select Hummer, Saturn, and Pontiac applications that require outside air control.

Key Features

  • Rotary switch activation type for HVAC blend door control
  • Plastic housing construction
  • Direct replacement for the original blend door actuator on listed applications
  • Designed for the main HVAC position
  • Fits vehicles requiring outside air, comes in a box
  • Part number: 604-187

Detailed Description

Dorman 604-187 is a heater blend door actuator made for precise HVAC air-mix control in select vehicles. It is engineered to match original equipment quality and performance, helping restore proper temperature blending and airflow direction in the cabin. This part cross-references Standard Ignition ADR4232 for the same application. It is a direct-fit option for 2006-2010 Hummer H3, 2009-2010 Hummer H3T, 2007-2010 Saturn Sky, and 2006-2009 Pontiac Solstice models in the main position.

What It Helps Fix

  • Incorrect cabin temperature control
  • Air stuck on hot or cold
  • HVAC airflow not responding to dash controls
  • Blend door movement issues in the main HVAC case
  • Outside air control problems on listed applications

Installation Notes and Tips

Verify the vehicle year, make, model, and HVAC position before installation. This part is listed for the main position on vehicles requiring outside air. Compare the original actuator connector, mounting points, and control style to confirm a proper match before replacement. Part number 604-187 should be matched to the vehicle application exactly, especially on Hummer H3, Hummer H3T, Saturn Sky, and Pontiac Solstice models.

Quality Assurance

Dorman states this HVAC heater blend door actuator is precision-engineered to match the quality and performance of the original actuator on the specified applications. The design follows OE-style fit and function for the listed vehicles, including 2006-2010 Hummer H3 and 2007-2010 Saturn Sky applications.

BrandDorman
Part Number604-187
MaterialPlastic
Package ContentsActuator
Switch Activation TypeRotary

This part fits 15 vehicles. Search below:

YearMakeModelPositionNotes
2010HummerH3MainFits vehicles requiring outside air, comes in a box.
2010HummerH3TMainFits vehicles requiring outside air, comes in a box.
2010SaturnSkyMainFits vehicles requiring outside air, comes in a box.
2009HummerH3MainFits vehicles requiring outside air, comes in a box.
2009HummerH3TMainFits vehicles requiring outside air, comes in a box.
2009PontiacSolsticeMainFits vehicles requiring outside air, comes in a box.
2009SaturnSkyMainFits vehicles requiring outside air, comes in a box.
2008HummerH3MainFits vehicles requiring outside air, comes in a box.
2008PontiacSolsticeMainFits vehicles requiring outside air, comes in a box.
2008SaturnSkyMainFits vehicles requiring outside air, comes in a box.
2007HummerH3MainFits vehicles requiring outside air, comes in a box.
2007PontiacSolsticeMainFits vehicles requiring outside air, comes in a box.
2007SaturnSkyMainFits vehicles requiring outside air, comes in a box.
2006HummerH3MainFits vehicles requiring outside air, comes in a box.
2006PontiacSolsticeMainFits vehicles requiring outside air, comes in a box.

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

10397102ADA281ADR4232ADS4232APBDA0265

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

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