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DormanPart #: 604-121
Dorman 604-121 HVAC Blend Door Actuator - Main
⚙️ 89 vehicles fit this part
Select your vehicle to confirm fitment
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✅OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: Chevrolet, GMC, Hummer, and Cadillac, Silverado 1500 Classic, Silverado 1500 HD Classic, Silverado 2500 HD Classic, Silverado 3500 Classic, Sierra 1500 Classic, Sierra 1500 HD Classic, Sierra 2500 HD Classic, Sierra 3500 Classic, H2, Escalade EXT, Avalanche 1500, Avalanche 2500, Silverado 1500, Silverado 1500 HD, Silverado 2500, Silverado 2500 HD, Silverado 3500, Sierra 1500, Sierra 1500 HD, Sierra 2500 HD, Sierra 3500, and Sierra 2500
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Not what you need? Click here for all HVAC Blend Door Actuator options
Reliable HVAC Blend Door Actuator for GM Trucks and SUVs
The Dorman 604-121 HVAC Blend Door Actuator is designed to restore proper airflow control in your vehicle's heating and cooling system. Engineered with a rotary switch activation type and durable plastic construction, this actuator is compatible with a range of Cadillac, Chevrolet, GMC, and Hummer models.
- Rotary switch activation for precise HVAC blend door control
- Durable plastic material ensures long-lasting performance
- Compatible with multiple GM trucks and SUVs including Silverado, Sierra, Avalanche, Escalade EXT, and H2
- Includes one actuator per package for straightforward replacement
- OEM-quality fitment for reliable operation
Product Details and Compatibility
The Dorman 604-121 HVAC Blend Door Actuator is specifically designed to fit a variety of General Motors vehicles. This actuator controls the blend door within the HVAC system, regulating the mix of hot and cold air to maintain the desired cabin temperature. Its rotary switch activation type allows for smooth and accurate adjustments. Constructed from durable plastic, the actuator withstands typical wear and tear from daily use. Compatible models include Chevrolet Silverado 1500, 2500, and 3500 series (including Classic and HD variants), GMC Sierra 1500, 2500, and 3500 series, Cadillac Escalade EXT, Chevrolet Avalanche 1500 and 2500, GMC Cheyenne, and Hummer H2.
Common HVAC Issues This Actuator Addresses
- Inconsistent or incorrect cabin temperature regulation
- Failure of blend door to move or respond to controls
- Unusual noises coming from the HVAC system during operation
- Airflow stuck on one temperature setting
- HVAC system unable to switch between heating and cooling modes
Installation Notes and Tips
- Ensure vehicle compatibility by verifying make, model, and year before installation
- Disconnect the vehicle battery prior to actuator replacement to prevent electrical issues
- Access the blend door actuator through the dashboard or glove compartment area as specified in the vehicle service manual
- Handle the plastic actuator carefully to avoid damage during installation
- Test the HVAC system after installation to confirm proper operation of the blend door
Quality Assurance and Warranty
Dorman parts are manufactured to meet or exceed OEM standards, providing reliable performance and fitment. The 604-121 HVAC Blend Door Actuator undergoes quality control inspections to ensure durability and functionality. This part is backed by Dorman's limited warranty, offering coverage against defects in material and workmanship under normal use.
| Brand | Dorman |
| Part Number | 604-121 |
| Material | Plastic |
| Package Contents | Actuator |
| Switch Activation Type | Rotary |
This part fits 89 vehicles. Search below:
| Year | Make | Model | Body Type | # Doors | Position | Notes |
|---|---|---|---|---|---|---|
| 2007 | Chevrolet | Silverado 1500 Classic | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2007 | Chevrolet | Silverado 1500 HD Classic | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2007 | Chevrolet | Silverado 2500 HD Classic | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2007 | Chevrolet | Silverado 3500 Classic | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2007 | GMC | Sierra 1500 Classic | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2007 | GMC | Sierra 1500 HD Classic | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2007 | GMC | Sierra 2500 HD Classic | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2007 | GMC | Sierra 3500 Classic | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2007 | Hummer | H2 | Main | HVAC Blend Door Actuator for mode selection in box packaging. | ||
| 2006 | Cadillac | Escalade EXT | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2006 | Chevrolet | Avalanche 1500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2006 | Chevrolet | Avalanche 2500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2006 | Chevrolet | Cheyenne | Main | Packaging Type: Box | ||
| 2006 | Chevrolet | Silverado 1500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2006 | Chevrolet | Silverado 1500 HD | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2006 | Chevrolet | Silverado 2500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2006 | Chevrolet | Silverado 2500 HD | Extended Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2006 | Chevrolet | Silverado 2500 HD | Crew Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2006 | Chevrolet | Silverado 3500 | Cab & Chassis | 4 Door | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box |
| 2006 | Chevrolet | Silverado 3500 | Extended Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2006 | Chevrolet | Silverado 3500 | Crew Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2006 | GMC | Sierra 1500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2006 | GMC | Sierra 1500 HD | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2006 | GMC | Sierra 2500 HD | Extended Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2006 | GMC | Sierra 2500 HD | Crew Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2006 | GMC | Sierra 3500 | Cab & Chassis | 4 Door | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box |
| 2006 | GMC | Sierra 3500 | Extended Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2006 | GMC | Sierra 3500 | Crew Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2006 | Hummer | H2 | Main | HVAC Blend Door Actuator for mode selection in box packaging. | ||
| 2005 | Cadillac | Escalade EXT | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2005 | Chevrolet | Avalanche 1500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2005 | Chevrolet | Avalanche 2500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2005 | Chevrolet | Cheyenne | Main | Packaging Type: Box | ||
| 2005 | Chevrolet | Silverado 1500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2005 | Chevrolet | Silverado 1500 HD | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2005 | Chevrolet | Silverado 2500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2005 | Chevrolet | Silverado 2500 HD | Extended Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2005 | Chevrolet | Silverado 2500 HD | Crew Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2005 | Chevrolet | Silverado 3500 | Cab & Chassis | 4 Door | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box |
| 2005 | Chevrolet | Silverado 3500 | Extended Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2005 | Chevrolet | Silverado 3500 | Crew Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2005 | GMC | Sierra 1500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2005 | GMC | Sierra 1500 HD | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2005 | GMC | Sierra 2500 HD | Extended Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2005 | GMC | Sierra 2500 HD | Crew Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2005 | GMC | Sierra 3500 | Cab & Chassis | 4 Door | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box |
| 2005 | GMC | Sierra 3500 | Extended Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2005 | GMC | Sierra 3500 | Crew Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2005 | Hummer | H2 | Main | HVAC Blend Door Actuator for mode selection in box packaging. | ||
| 2004 | Cadillac | Escalade EXT | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2004 | Chevrolet | Avalanche 1500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2004 | Chevrolet | Avalanche 2500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2004 | Chevrolet | Cheyenne | Main | Packaging Type: Box | ||
| 2004 | Chevrolet | Silverado 1500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2004 | Chevrolet | Silverado 2500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2004 | Chevrolet | Silverado 2500 HD | Extended Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2004 | Chevrolet | Silverado 2500 HD | Crew Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2004 | Chevrolet | Silverado 3500 | Cab & Chassis | 4 Door | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box |
| 2004 | Chevrolet | Silverado 3500 | Extended Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2004 | Chevrolet | Silverado 3500 | Crew Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2004 | GMC | Sierra 1500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2004 | GMC | Sierra 2500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2004 | GMC | Sierra 2500 HD | Extended Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2004 | GMC | Sierra 2500 HD | Crew Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2004 | GMC | Sierra 3500 | Cab & Chassis | 4 Door | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box |
| 2004 | GMC | Sierra 3500 | Extended Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2004 | GMC | Sierra 3500 | Crew Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2004 | Hummer | H2 | Main | HVAC Blend Door Actuator for mode selection in box packaging. | ||
| 2003 | Cadillac | Escalade EXT | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2003 | Chevrolet | Avalanche 1500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2003 | Chevrolet | Avalanche 2500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2003 | Chevrolet | Cheyenne | Main | Packaging Type: Box | ||
| 2003 | Chevrolet | Silverado 1500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2003 | Chevrolet | Silverado 1500 HD | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2003 | Chevrolet | Silverado 2500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2003 | Chevrolet | Silverado 2500 HD | Extended Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2003 | Chevrolet | Silverado 2500 HD | Crew Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2003 | Chevrolet | Silverado 3500 | Cab & Chassis | 4 Door | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box |
| 2003 | Chevrolet | Silverado 3500 | Extended Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2003 | Chevrolet | Silverado 3500 | Crew Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2003 | GMC | Sierra 1500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2003 | GMC | Sierra 1500 HD | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2003 | GMC | Sierra 2500 | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | ||
| 2003 | GMC | Sierra 2500 HD | Extended Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2003 | GMC | Sierra 2500 HD | Crew Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2003 | GMC | Sierra 3500 | Cab & Chassis | 4 Door | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box |
| 2003 | GMC | Sierra 3500 | Extended Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2003 | GMC | Sierra 3500 | Crew Cab Pickup | Main | Mode; w/RPO Code CJ3 (Front Manual Temperature Controls); w/RPO Code D07 (Custom Front Floor Console); Packaging Type: Box | |
| 2003 | Hummer | H2 | Main | HVAC Blend Door Actuator for mode selection in box packaging. |
* 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:
15-7300060412189022572ADS160APBDA0220F04088SK604121
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.