Four Seasons 73779 HVAC Blend Door Actuator - Left
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Four Seasons

Four Seasons 73779 HVAC Blend Door Actuator - Left

Brand Four Seasons 73779
Position Left
Door Linkage Arm
Mounting Ear Qty. 4
Style Hvac air door actuator
Terminal Pin Qty. 7
Fits Subaru · 9 vehicles

Direct-fit replacement. Restores HVAC air door control with an original-style actuator layout.

Arm linkage design. Uses a 4-ear mount and 7-pin connection for the listed applications.

Four Seasons engineering. Backed by more than 50 years of mobile A/C experience.

Cross-references Four Seasons 73779 and 72131AG27A for the same application. See all 2.

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HVAC Blend Door Actuator Overview

The Four Seasons 73779 HVAC blend door actuator is a direct-fit replacement for the climate control air door mechanism. It is built for Subaru applications that need precise door movement to regulate cabin air temperature and airflow.

Compatible With Subaru Legacy and Subaru Outback applications, this actuator uses an arm-style door linkage, a 4-ear mounting pattern, and a 7-pin terminal layout. The Four Seasons 73779 is a practical replacement for restoring proper HVAC door operation when the original actuator wears out or stops responding.

Key Features

  • HVAC air door actuator design for blend door control
  • Arm-style linkage for the door mechanism
  • 4 mounting ears for secure installation
  • 7-terminal electrical connection
  • Four Seasons part number 73779

Detailed Description

Four Seasons 73779 is an HVAC blend door actuator used to move the air door inside the climate control system. In Subaru Legacy and Subaru Outback applications, this part helps restore correct temperature blending by controlling the position of the HVAC door. The arm linkage and 7-pin configuration support the original-style actuator layout for the listed fitments.

This part cross-references 72131AG27A for the same application. Four Seasons draws on more than 50 years of mobile A/C experience, and this actuator is engineered and tested for dependable operation in the HVAC system.

Common Issues It Can Address

  • Incorrect cabin temperature control
  • HVAC doors that do not move properly
  • Loss of airflow direction or blend control
  • Actuator noise from a worn internal mechanism
  • Climate control response problems in the dash HVAC system

Installation Notes and Tips

Verify the connector style, mounting ear count, and door linkage style before installation. This actuator is listed for Fits 2005-2008 Subaru Outback, left; Fits 2009 Subaru Outback, left, to 2/09; and Fits 2006-2009 Subaru Legacy, left. Confirm the vehicle build date for 2009 Outback applications before ordering.

Quality Assurance

Four Seasons states that its products are engineered and tested for years of trouble-free operation, backed by more than 50 years of mobile A/C experience.

Related reading

This part fits 9 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2009SubaruLegacyLeft—
2009SubaruOutbackLeftTo 2/09
2008SubaruLegacyLeft—
2008SubaruOutbackLeft—
2007SubaruLegacyLeft—
2007SubaruOutbackLeft—
2006SubaruLegacyLeft—
2006SubaruOutbackLeft—
2005SubaruOutbackLeft—
Directly replaces or cross-references 2 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Four Seasons — 7377972131AG27A