Restore proper temperature control with the Dorman blend door actuator (P/N 604-951), an electric HVAC heater blend door actuator that drives the air-blend door to set the mix of warm and cool air reaching the cabin. It's a direct-fit replacement for a range of medium-duty trucks, including the 1997-2002 and 2004-2009 Chevrolet T6500 and T7500, the 2004-2009 Chevrolet T8500, the 1997-2002 and 2004-2009 GMC T6500 and T7500, and Isuzu FRR (2000-2004), FSR (1996-2002), FTR (1996-2009), FVR (1996-2009) and FXR (2004-2009).
- Direct replacement: engineered to install and operate like the original air door actuator on the listed applications.
- Position specific: many vehicles use several HVAC door actuators for different locations and functions — review this part's application notes to confirm it matches the actuator you need to replace.
- Durable construction: designed and tested to strict standards to help resist wear and electrical burnout for reliable operation.
- Backed by expertise: supported by a team of engineers in the United States.
If a failed blend door actuator is the cause of inconsistent or stuck cabin temperature, this replaces it. See the Buyer's Guide tab for the full application and engine list.
Interchange: 1835798300 · 8972213110 · 97721515 · 1835798301 · DA1360
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does the Dorman air door actuator 604-951 do?
It's an electric HVAC actuator that moves the blend door to control how warm and cool air mix, setting the cabin temperature. It replaces the original blend door actuator on the listed applications.
Will this Dorman hvac heater blend door actuator fit my truck?
It's a direct-fit replacement for Chevrolet T6500/T7500/T8500, GMC T6500/T7500 and Isuzu FRR/FSR/FTR/FVR/FXR models. Check the Buyer's Guide tab for exact years.
My cabin temperature won't change — is this the fix?
Inconsistent or stuck temperature can point to a failed blend door actuator, but other causes are possible. Diagnose the fault first; if this actuator is the cause, 604-951 replaces it.
How do I know I'm ordering the correct actuator position?
Many vehicles use several HVAC door actuators for different positions and functions. Review this part's application notes to verify it matches the actuator you need, or consult a qualified technician.
What interchange numbers does this Dorman heater blend door actuator replace?
It cross-references 1835798300, 8972213110, 97721515, 1835798301 and DA1360.
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