Swap out a whining or stuck actuator with the Dorman blend door actuator 604-120, an HVAC heater blend door actuator that repositions the blend door so your system delivers the temperature you select. It's the MAIN blend-door position and installs as a direct-fit replacement across GM full-size trucks and SUVs — including the 1999-2006 Chevrolet Silverado 1500, 2000-2006 Chevrolet Tahoe, 2002-2006 Cadillac Escalade, 2003-2009 GMC Envoy, 2003-2009 Chevrolet TrailBlazer and 2004-2007 Buick Rainier. It fits 42 applications in all; see the Buyer's Guide tab for the full list.
- Direct replacement: engineered to drop in like the original air door actuator on the listed applications to restore proper HVAC operation.
- Position specific: many vehicles use several HVAC door actuators — review this part's application notes to confirm it matches the location and function of the actuator you're replacing (this is the MAIN position).
- Durable construction: designed and tested to strict standards to help resist wear and electrical burnout for reliable operation.
- Trustworthy quality: backed by a team of experts and engineers in the United States and more than a century of experience.
Interchange: 15-72506 · 15-73599
1572506 · 1573599 · ADS113 · F04015 · 73013 · 52474795 · 89018373 · 89018678 · DA1059 · ADA121 · SK604120 · ADR113
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does this Dorman air door actuator do?
It's a small electric motor that moves the blend door inside the HVAC case, controlling how much air is routed through the heater core to set cabin temperature. This is the MAIN blend-door position.
What are signs this blend door actuator may need replacing?
Common signs include inconsistent or stuck cabin temperature, a clicking or tapping noise behind the dash, or temperature that won't respond to the controls. Diagnose the cause before replacing.
Will 604-120 fit my vehicle?
It's a direct-fit replacement for 42 GM applications, such as the 1999-2006 Chevrolet Silverado 1500 and 2003-2009 GMC Envoy. Check the Buyer's Guide tab to confirm your year, make and model.
My vehicle has more than one actuator — is this the right one?
Vehicles often use several HVAC door actuators for different positions. This is the MAIN position; review the application notes to verify it matches the location and function of the one you need.
Does this Dorman hvac heater blend door actuator fit a 2002-2006 Cadillac Escalade?
Yes, the 2002-2006 Cadillac Escalade is among the listed applications. See the Buyer's Guide tab to confirm the exact fit for your configuration.
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