Dorman 604-921 HVAC Blend Door Actuator - Main or Right Main
OE Quality 60-Day Returns
Dorman

Dorman 604-921 HVAC Blend Door Actuator - Main or Right Main

Brand Dorman 604-921
Position Main
Material Plastic
Package Contents 1 Air Door Actuator
Switch Activation Type Rotary
Fits Chevrolet and GMC · 150 vehicles

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

Rotary activation. Smooth, precise control of the blend door actuator.

Plastic construction. Lightweight design for dependable HVAC operation.

Cross-references 1996840 for the same application. See all 1.

$73.86Free shipping
In stock · usually ships same day before 1pm CST
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Free returns within 60 days if it doesn't fit when fitment is verified.
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Dorman HVAC Blend Door Actuator 604-921

Dorman 604-921 is a rotary HVAC blend door actuator engineered to match the quality and performance of the original unit on select Chevrolet Express and GMC Savana vans. It helps restore proper air door movement for consistent cabin temperature control and defrost operation.

Key Features

  • Rotary switch activation type for HVAC air door control
  • Plastic housing construction
  • Direct replacement style for select GM van applications
  • Matches original actuator quality and performance for the listed vehicles
  • Cross-reference part number: 1996840

Detailed Description

This HVAC heater blend door actuator is built for specific Chevrolet Express 1500, Chevrolet Express 2500, Chevrolet Express 3500, GMC Savana 1500, GMC Savana 2500, and GMC Savana 3500 applications. Dorman 604-921 is used to control the blend door position inside the HVAC system, helping direct airflow for heat, defrost, and temperature mixing. For buyers searching for a Chevrolet Express blend door actuator or GMC Savana HVAC actuator, this part number provides a direct-fit replacement option for the listed model years.

Compatible With 1996-2014 Chevrolet Express 1500, Main; 1996-2019 Chevrolet Express 2500, Main; 1996-2019 Chevrolet Express 3500, Main; 1996-2014 GMC Savana 1500, Main; 1996-2019 GMC Savana 2500, Main; and 1996-2019 GMC Savana 3500, Main. It also fits 2020-2023 Chevrolet Express 2500, Main; 2020-2023 Chevrolet Express 3500, Main; 2020-2023 GMC Savana 2500, Main; and 2020-2023 GMC Savana 3500, Main.

Common Issues This Part Can Address

  • Incorrect cabin temperature from a stuck blend door actuator
  • No response when changing HVAC mode or temperature settings
  • Loss of defrost airflow control
  • Clicking or repeated actuator movement from a worn HVAC actuator
  • Uneven heat distribution in the dash HVAC system

Installation Notes and Tips

Verify the vehicle year, make, model, and HVAC position before ordering. Compare the original actuator connector, mounting points, and rotary-style operation to confirm match. After installation, cycle the HVAC controls to allow the system to relearn door positions if required by the vehicle.

Quality Assurance

Dorman designs this replacement actuator to match original equipment quality and performance for the specified applications. The part is built as a direct replacement for the listed Chevrolet and GMC van fitments.

Related reading

This part fits 150 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2023ChevroletExpress 2500MainPackaging Type: Box
2023ChevroletExpress 3500MainPackaging Type: Box
2023GMCSavana 2500MainPackaging Type: Box
2023GMCSavana 3500MainPackaging Type: Box
2022ChevroletExpress 2500MainPackaging Type: Box
2022ChevroletExpress 3500MainPackaging Type: Box
2022GMCSavana 2500MainPackaging Type: Box
2022GMCSavana 3500MainPackaging Type: Box
2021ChevroletExpress 2500MainPackaging Type: Box
2021ChevroletExpress 3500MainPackaging Type: Box
2021GMCSavana 2500MainPackaging Type: Box
2021GMCSavana 3500MainPackaging Type: Box
2020ChevroletExpress 2500MainPackaging Type: Box
2020ChevroletExpress 3500MainPackaging Type: Box
2020GMCSavana 2500MainPackaging Type: Box
2020GMCSavana 3500MainPackaging Type: Box
2019ChevroletExpress 2500MainDefrost; Box packaging.
2019ChevroletExpress 3500MainDefrost; Box packaging.
2019GMCSavana 2500MainDefrost; Box packaging.
2019GMCSavana 3500MainDefrost; Box packaging.
2018ChevroletExpress 2500MainDefrost; Box packaging.
2018ChevroletExpress 3500MainDefrost; Box packaging.
2018GMCSavana 2500MainDefrost; Box packaging.
2018GMCSavana 3500MainDefrost; Box packaging.
2017ChevroletExpress 2500MainDefrost; Box packaging.
2017ChevroletExpress 3500MainDefrost; Box packaging.
2017GMCSavana 2500MainDefrost; Box packaging.
2017GMCSavana 3500MainDefrost; Box packaging.
2016ChevroletExpress 2500MainDefrost; Box packaging.
2016ChevroletExpress 3500MainDefrost; Box packaging.
2016GMCSavana 2500MainDefrost; Box packaging.
2016GMCSavana 3500MainDefrost; Box packaging.
2015ChevroletExpress 2500MainDefrost; Box packaging.
2015ChevroletExpress 3500MainDefrost; Box packaging.
2015GMCSavana 2500MainDefrost; Box packaging.
2015GMCSavana 3500MainDefrost; Box packaging.
2014ChevroletExpress 1500MainDefrost; Box packaging.
2014ChevroletExpress 2500MainDefrost; Box packaging.
2014ChevroletExpress 3500MainDefrost; Box packaging.
2014GMCSavana 1500MainDefrost; Box packaging.
2014GMCSavana 2500MainDefrost; Box packaging.
2014GMCSavana 3500MainDefrost; Box packaging.
2013ChevroletExpress 1500MainDefrost; Box packaging.
2013ChevroletExpress 2500MainDefrost; Box packaging.
2013ChevroletExpress 3500MainDefrost; Box packaging.
2013GMCSavana 1500MainDefrost; Box packaging.
2013GMCSavana 2500MainDefrost; Box packaging.
2013GMCSavana 3500MainDefrost; Box packaging.
2012ChevroletExpress 1500MainDefrost; Box packaging.
2012ChevroletExpress 2500MainDefrost; Box packaging.
2012ChevroletExpress 3500MainDefrost; Box packaging.
2012GMCSavana 1500MainDefrost; Box packaging.
2012GMCSavana 2500MainDefrost; Box packaging.
2012GMCSavana 3500MainDefrost; Box packaging.
2011ChevroletExpress 1500MainDefrost; Box packaging.
2011ChevroletExpress 2500MainDefrost; Box packaging.
2011ChevroletExpress 3500MainDefrost; Box packaging.
2011GMCSavana 1500MainDefrost; Box packaging.
2011GMCSavana 2500MainDefrost; Box packaging.
2011GMCSavana 3500MainDefrost; Box packaging.
2010ChevroletExpress 1500MainDefrost; Box packaging.
2010ChevroletExpress 2500MainDefrost; Box packaging.
2010ChevroletExpress 3500MainDefrost; Box packaging.
2010GMCSavana 1500MainDefrost; Box packaging.
2010GMCSavana 2500MainDefrost; Box packaging.
2010GMCSavana 3500MainDefrost; Box packaging.
2009ChevroletExpress 1500MainDefrost; Box packaging.
2009ChevroletExpress 2500MainDefrost; Box packaging.
2009ChevroletExpress 3500MainDefrost; Box packaging.
2009GMCSavana 1500MainDefrost; Box packaging.
2009GMCSavana 2500MainDefrost; Box packaging.
2009GMCSavana 3500MainDefrost; Box packaging.
2008ChevroletExpress 1500MainDefrost; Box packaging.
2008ChevroletExpress 2500MainDefrost; Box packaging.
2008ChevroletExpress 3500MainDefrost; Box packaging.
2008GMCSavana 1500MainDefrost; Box packaging.
2008GMCSavana 2500MainDefrost; Box packaging.
2008GMCSavana 3500MainDefrost; Box packaging.
2007ChevroletExpress 1500MainDefrost; Box packaging.
2007ChevroletExpress 2500MainDefrost; Box packaging.
2007ChevroletExpress 3500MainDefrost; Box packaging.
2007GMCSavana 1500MainDefrost; Box packaging.
2007GMCSavana 2500MainDefrost; Box packaging.
2007GMCSavana 3500MainDefrost; Box packaging.
2006ChevroletExpress 1500MainDefrost; Box packaging.
2006ChevroletExpress 2500MainDefrost; Box packaging.
2006ChevroletExpress 3500MainDefrost; Box packaging.
2006GMCSavana 1500MainDefrost; Box packaging.
2006GMCSavana 2500MainDefrost; Box packaging.
2006GMCSavana 3500MainDefrost; Box packaging.
2005ChevroletExpress 1500MainDefrost; Box packaging.
2005ChevroletExpress 2500MainDefrost; Box packaging.
2005ChevroletExpress 3500MainDefrost; Box packaging.
2005GMCSavana 1500MainDefrost; Box packaging.
2005GMCSavana 2500MainDefrost; Box packaging.
2005GMCSavana 3500MainDefrost; Box packaging.
2004ChevroletExpress 1500MainDefrost; Box packaging.
2004ChevroletExpress 2500MainDefrost; Box packaging.
2004ChevroletExpress 3500MainDefrost; Box packaging.
2004GMCSavana 1500MainDefrost; Box packaging.
2004GMCSavana 2500MainDefrost; Box packaging.
2004GMCSavana 3500MainDefrost; Box packaging.
2003ChevroletExpress 1500MainDefrost; Box packaging.
2003ChevroletExpress 2500MainDefrost; Box packaging.
2003ChevroletExpress 3500MainDefrost; Box packaging.
2003GMCSavana 1500MainDefrost; Box packaging.
2003GMCSavana 2500MainDefrost; Box packaging.
2003GMCSavana 3500MainDefrost; Box packaging.
2002ChevroletExpress 1500MainDefrost; Box packaging.
2002ChevroletExpress 2500MainDefrost; Box packaging.
2002ChevroletExpress 3500MainDefrost; Box packaging.
2002GMCSavana 1500MainDefrost; Box packaging.
2002GMCSavana 2500MainDefrost; Box packaging.
2002GMCSavana 3500MainDefrost; Box packaging.
2001ChevroletExpress 1500MainDefrost; Box packaging.
2001ChevroletExpress 2500MainDefrost; Box packaging.
2001ChevroletExpress 3500MainDefrost; Box packaging.
2001GMCSavana 1500MainDefrost; Box packaging.
2001GMCSavana 2500MainDefrost; Box packaging.
2001GMCSavana 3500MainDefrost; Box packaging.
2000ChevroletExpress 1500MainDefrost; Box packaging.
2000ChevroletExpress 2500MainDefrost; Box packaging.
2000ChevroletExpress 3500MainDefrost; Box packaging.
2000GMCSavana 1500MainDefrost; Box packaging.
2000GMCSavana 2500MainDefrost; Box packaging.
2000GMCSavana 3500MainDefrost; Box packaging.
1999ChevroletExpress 1500MainDefrost; Box packaging.
1999ChevroletExpress 2500MainDefrost; Box packaging.
1999ChevroletExpress 3500MainDefrost; Box packaging.
1999GMCSavana 1500MainDefrost; Box packaging.
1999GMCSavana 2500MainDefrost; Box packaging.
1999GMCSavana 3500MainDefrost; Box packaging.
1998ChevroletExpress 1500MainDefrost; Box packaging.
1998ChevroletExpress 2500MainDefrost; Box packaging.
1998ChevroletExpress 3500MainDefrost; Box packaging.
1998GMCSavana 1500MainDefrost; Box packaging.
1998GMCSavana 2500MainDefrost; Box packaging.
1998GMCSavana 3500MainDefrost; Box packaging.
1997ChevroletExpress 1500MainDefrost; Box packaging.
1997ChevroletExpress 2500MainDefrost; Box packaging.
1997ChevroletExpress 3500MainDefrost; Box packaging.
1997GMCSavana 1500MainDefrost; Box packaging.
1997GMCSavana 2500MainDefrost; Box packaging.
1997GMCSavana 3500MainDefrost; Box packaging.
1996ChevroletExpress 1500MainDefrost; Box packaging.
1996ChevroletExpress 2500MainDefrost; Box packaging.
1996ChevroletExpress 3500MainDefrost; Box packaging.
1996GMCSavana 1500MainDefrost; Box packaging.
1996GMCSavana 2500MainDefrost; Box packaging.
1996GMCSavana 3500MainDefrost; Box packaging.
Directly replaces or cross-references 1 part number
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
1996840