Four Seasons 73770 HVAC Mode Door Actuator - Auxiliary
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Four Seasons

Four Seasons 73770 HVAC Mode Door Actuator - Auxiliary

Brand Four Seasons 73770
Position Auxiliary
Door Linkage Gear
Mounting Ear Qty. 4
Style Hvac air door actuator
Terminal Pin Qty. 5
Fits Subaru · 6 vehicles

Gear linkage design. Provides controlled HVAC door movement for reliable climate control operation.

5-pin connector. Uses a five-terminal layout for the actuator electrical connection.

Four Seasons 73770. Direct replacement part identified for auxiliary HVAC air door service.

Cross-references Four Seasons 73770 and 72131XC01A for the same application. See all 2.

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Free returns within 60 days if it doesn't fit when fitment is verified.

HVAC Mode Door Actuator Overview

The Four Seasons 73770 HVAC mode door actuator is built for direct replacement in the climate control system. It is a gear-driven HVAC air door actuator with a 5-pin terminal layout and 4 mounting ears for secure installation.

Compatible With 2019-2024 Subaru Ascent auxiliary HVAC applications, this part helps restore proper air door movement when the original actuator is worn or no longer responding correctly. The Four Seasons 73770 is a practical choice for Subaru Ascent owners addressing HVAC airflow control issues.

Key Features

  • Gear linkage design for controlled HVAC door movement
  • HVAC air door actuator style for climate control operation
  • 5-terminal pin configuration
  • 4 mounting ears for a stable mounting pattern
  • Four Seasons part number 73770

Detailed Description

Four Seasons 73770 is an auxiliary HVAC mode door actuator for 2019-2024 Subaru Ascent models. It is used in the climate control system to move the air door that directs airflow through the cabin vents, helping maintain correct mode selection. If the actuator fails, the system may stop changing airflow direction as commanded, and this replacement restores the mechanical function of the door linkage. This Four Seasons HVAC actuator is identified by part number 73770 and cross-references 72131XC01A for the same application.

Common Issues It Can Solve

  • Airflow stuck on one vent setting
  • Mode changes that do not respond to control input
  • Clicking or gear-related noise from the HVAC actuator area
  • Inconsistent cabin airflow direction
  • Loss of proper auxiliary HVAC door movement

Installation Notes

Verify the connector style, mounting ear layout, and auxiliary application before installation. Confirm fitment for 2019-2024 Subaru Ascent models and compare the removed unit to part number 73770 to ensure the replacement matches the original actuator configuration.

Quality Assurance

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

Related reading

This part fits 6 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2024SubaruAscentAuxiliary—
2023SubaruAscentAuxiliary—
2022SubaruAscentAuxiliary—
2021SubaruAscentAuxiliary—
2020SubaruAscentAuxiliary—
2019SubaruAscentAuxiliary—
Directly replaces or cross-references 2 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Four Seasons — 7377072131XC01A