Dorman 604-159 HVAC Blend Door Actuator - Main
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Dorman

Dorman 604-159 HVAC Blend Door Actuator - Main

Brand Dorman 604-159
Position Main
Material Plastic
Package Contents Actuator
Switch Activation Type Rotary
Fits Cadillac · 2 vehicles

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

Rotary activation. Smoothly controls the HVAC blend door.

Plastic construction. Lightweight actuator built for HVAC use.

Cross-references Standard Ignition ADR4219, 25815468 and ADS4219 for the same application. See all 4.

$40.09Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
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Step 2 — Quantity
Order total $40.09
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all HVAC Blend Door Actuator options

Dorman 604-159 HVAC Blend Door Actuator

This HVAC blend door actuator is built for specific Cadillac CTS applications and uses a rotary switch activation design for controlled movement of the heater blend door. Dorman 604-159 is engineered to match the fit and function of the original actuator on the listed vehicles.

  • Rotary switch activation type for blend door control
  • Plastic housing construction
  • Package contents: actuator
  • Direct replacement for select Cadillac CTS HVAC systems
  • Cross-references Standard Ignition ADR4219 for the same application

Detailed Product Information

Dorman 604-159 is an HVAC heater blend door actuator designed for 2008-2009 Cadillac CTS models with the main position application. It is intended for vehicles requiring outside air and is built to align with the original actuator’s quality and performance characteristics. If you are searching for a Cadillac CTS blend door actuator, HVAC actuator replacement, or Dorman 604-159 for 2008 Cadillac CTS and 2009 Cadillac CTS, this part matches the listed fitment.

The plastic actuator body and rotary activation design support precise blend door movement within the HVAC system. This helps restore proper temperature control when the original actuator is worn, noisy, or no longer responding correctly. Dorman 604-159 is also referenced by part numbers 25815468 and ADS4219 for the same application.

What This Part Helps Fix

  • Incorrect cabin temperature output from the HVAC system
  • Blend door movement that is stuck or inconsistent
  • Clicking or ticking noises from the dash area
  • Loss of proper air mixing between hot and cold settings
  • HVAC controls that no longer respond as expected

Installation Notes and Tips

Verify the vehicle’s HVAC actuator location before installation and confirm the connector style and mounting points match the original unit. For 2008-2009 Cadillac CTS blend door actuator replacement, compare the old part number and the vehicle’s HVAC configuration to the listed fitment before installation. After installation, cycle the ignition and HVAC controls to allow the system to relearn actuator position if required by the vehicle.

Quality Assurance

Dorman designs this actuator to match the original part’s quality and performance on the specified Cadillac CTS applications. The part is built as a direct-fit replacement for the listed vehicles and applications.

Related reading

This part fits 2 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2009CadillacCTSMainPackaging Type: Box
2008CadillacCTSMainFits vehicles requiring outside air, comes in a box.
Directly replaces or cross-references 4 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Standard Ignition — ADR421925815468ADS4219APBDA0186