Dorman 604-187 HVAC Blend Door Actuator - Main
OE Quality 60-Day Returns
Dorman

Dorman 604-187 HVAC Blend Door Actuator - Main

Brand Dorman 604-187
Position Main
Material Plastic
Package Contents Actuator
Switch Activation Type Rotary
Fits Hummer, Saturn, and Pontiac · 15 vehicles

OE-style replacement. Precision-engineered to match original quality and performance.

Rotary activation. Smoothly controls the blend door for consistent HVAC operation.

Plastic construction. Lightweight actuator built for dependable everyday use.

Cross-references Standard Ignition ADR4232, 10397102 and ADA281 for the same application. See all 5.

$39.89Free shipping
In stock · usually ships same day before 1pm CST
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Order total $39.89
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Free returns within 60 days if it doesn't fit when fitment is verified.
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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.

Related reading

This part fits 15 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
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.
Directly replaces or cross-references 5 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Standard Ignition — ADR423210397102ADA281ADS4232APBDA0265