Four Seasons 73174 HVAC Recirculation Door Actuator

Four Seasons 73174 Air Door Actuator Overview

Four Seasons 73174 is an HVAC recirculation door actuator for vehicles equipped with an air door actuator style system. It uses a 5-pin terminal layout, an arm-style door linkage, and a 4-ear mounting design to support proper recirculation door movement in the climate control housing.

Compatible With Cadillac CTS, Cadillac STS, and Cadillac SRX applications across the listed model years, this Four Seasons Air Door Actuator is a direct-fit replacement for common HVAC recirculation door concerns. The Four Seasons 73174 part number is also referenced in cross-application catalogs for service matching.

Key Features

• HVAC recirculation door actuator for climate control air door operation
• Arm-style door linkage for recirculation door movement
• 4 mounting ears for secure installation alignment
• 5-terminal pin configuration
• Four Seasons Air Door Actuator line for HVAC service replacement
• Part number 73174 for catalog and fitment lookup

Detailed Description

Four Seasons 73174 is built for HVAC systems that use a recirculation door actuator to control cabin air routing. In Cadillac CTS, Cadillac STS, and Cadillac SRX models, this actuator helps move the recirculation door between fresh-air and recirculated-air positions so the HVAC system can respond correctly to driver commands. The arm linkage and 4-ear mounting style support the actuator’s connection to the HVAC case, while the 5-pin terminal design matches the electrical interface used by the vehicle system.

This part cross-references ACDelco 604162 for the same application.

What It Helps Fix

• Recirculation door stuck in one position
• HVAC system not switching between fresh air and recirculated air
• Improper airflow direction from the climate control system
• Clicking or repeated actuator movement inside the dash area
• Temperature or airflow control issues tied to the air door mechanism

Installation Notes and Tips

Verify the actuator style, terminal count, linkage type, and mounting ear layout before installation. On Cadillac CTS, Cadillac STS, and Cadillac SRX HVAC systems, confirm the recirculation door shaft or arm aligns correctly with the actuator before securing the unit. After installation, cycle the HVAC controls to confirm smooth door movement and proper recirculation function.

Quality Assurance

Four Seasons is a recognized aftermarket brand in HVAC service parts, and part number 73174 is cataloged for the listed Cadillac applications. Confirm fitment by year, model, and HVAC configuration before ordering.