Dorman 604-900 HVAC Blend Door Actuator - Left Main or Main
OE Quality 60-Day Returns
Dorman

Dorman 604-900 HVAC Blend Door Actuator - Left Main or Main

Brand Dorman 604-900
Position Left Main
Material Plastic
Package Contents Actuator
Switch Activation Type Rotary
Fits Buick, Chevrolet, Pontiac, and Oldsmobile · 26 vehicles

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

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

Plastic construction. Lightweight design for dependable HVAC operation.

Cross-references Standard Ignition ADR135, 10424941 and ADS135 for the same application. See all 5.

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Dorman 604-900 HVAC Blend Door Actuator

Dorman 604-900 is an HVAC heater blend door actuator engineered to match the fit and function of the original unit on select GM vehicles. It uses a rotary switch activation type and a plastic housing for temperature blend control in the HVAC system.

Key Features

  • Rotary actuator design for HVAC temperature blend control
  • Plastic construction for direct replacement use
  • Matches original actuator quality and performance on listed applications
  • Includes actuator only
  • Cross-references Standard Ignition ADR135 for the same application

Detailed Description

This HVAC blend door actuator is built for vehicles that use manual front temperature controls and specific GM option codes. It is a direct-fit replacement for applications such as the Buick Rendezvous, Pontiac Aztek, Pontiac Montana, and Oldsmobile Silhouette. If your Buick Rendezvous, Pontiac Aztek, or Pontiac Montana has inconsistent cabin temperature control, Dorman 604-900 provides the replacement actuator needed to restore blend door movement.

Part number 604-900 is listed for left main and main positions depending on the vehicle application. The design follows the original actuator layout so it can be used in temperature control HVAC systems without changing the intended control strategy.

What It Helps Solve

  • Cabin air stuck on hot or cold
  • Temperature changes that do not respond to the control knob
  • Blend door movement problems in the HVAC case
  • Clicking or inconsistent actuator operation behind the dash
  • Loss of proper temperature mixing in the heating and cooling system

Installation Notes and Tips

  • Verify the vehicle’s year, make, model, and HVAC option code before ordering.
  • Confirm whether the application uses the left main or main actuator position.
  • Inspect the blend door and HVAC housing for binding before installing the replacement actuator.
  • Use the existing electrical connector and mounting location specified by the vehicle application.

Quality Assurance

Dorman engineers this HVAC heater blend door actuator to match the quality and performance of the original part on the listed vehicles. It is a direct replacement for select Buick Rendezvous, Pontiac Aztek, Pontiac Montana, and Oldsmobile Silhouette applications, with interchange support including Standard Ignition ADR135 and part number 604-900.

Related reading

This part fits 26 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelPositionNotes
2007BuickRendezvous—Left MainTemperature; w/RPO Code CJ3 (Front Manual Temperature Controls); Packaging Type: Box
2007BuickRendezvous—MainTemperature; w/RPO Code C60 (Front Manual Temperature Controls); Packaging Type: Box
2006BuickRendezvous—Left MainTemperature; w/RPO Code CJ3 (Front Manual Temperature Controls); Packaging Type: Box
2006BuickRendezvous—MainTemperature; w/RPO Code C60 (Front Manual Temperature Controls); Packaging Type: Box
2005BuickRendezvous—Left MainTemperature; w/RPO Code CJ3 (Front Manual Temperature Controls); Packaging Type: Box
2005BuickRendezvous—MainTemperature; w/RPO Code C60 (Front Manual Temperature Controls); Packaging Type: Box
2005PontiacAztek—MainTemperature control HVAC blend door actuator for box packaging.
2005PontiacMontanaBaseMainTemperature control HVAC blend door actuator for box packaging.
2004BuickRendezvous—Left MainTemperature; w/RPO Code CJ3 (Front Manual Temperature Controls); Packaging Type: Box
2004BuickRendezvous—MainTemperature; w/RPO Code C60 (Front Manual Temperature Controls); Packaging Type: Box
2004OldsmobileSilhouette—MainTemperature control HVAC blend door actuator for box packaging.
2004PontiacAztek—MainTemperature control HVAC blend door actuator for box packaging.
2004PontiacMontana—MainTemperature control HVAC blend door actuator for box packaging.
2003BuickRendezvous—Left MainTemperature; w/RPO Code CJ3 (Front Manual Temperature Controls); Packaging Type: Box
2003BuickRendezvous—MainTemperature; w/RPO Code C60 (Front Manual Temperature Controls); Packaging Type: Box
2003OldsmobileSilhouette—MainTemperature control HVAC blend door actuator for box packaging.
2003PontiacAztek—MainTemperature control HVAC blend door actuator for box packaging.
2003PontiacMontana—MainTemperature control HVAC blend door actuator for box packaging.
2002BuickRendezvous—Left MainTemperature; w/RPO Code CJ3 (Front Manual Temperature Controls); Packaging Type: Box
2002BuickRendezvous—MainTemperature; w/RPO Code C60 (Front Manual Temperature Controls); Packaging Type: Box
2002OldsmobileSilhouette—MainTemperature control HVAC blend door actuator for box packaging.
2002PontiacAztek—MainTemperature control HVAC blend door actuator for box packaging.
2002PontiacMontana—MainTemperature control HVAC blend door actuator for box packaging.
2001OldsmobileSilhouette—MainTemperature control HVAC blend door actuator for box packaging.
2001PontiacAztek—MainTemperature control HVAC blend door actuator for box packaging.
2001PontiacMontana—MainTemperature control HVAC blend door actuator for box packaging.
Directly replaces or cross-references 5 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Standard Ignition — ADR13510424941ADS135F04051SK604900