Four Seasons 73173 HVAC Blend Door Actuator - Right

Four Seasons 73173 Air Door Actuator Overview

The Four Seasons 73173 HVAC blend door actuator controls air door movement inside the climate system to help direct airflow where it is needed. This air door actuator is built for right-side applications on select Cadillac CTS and Cadillac STS models, making it a direct-fit service part for temperature and airflow control concerns.

Four Seasons Air Door Actuator products are part of the brand’s HVAC component line, focused on replacement parts for heating and air conditioning systems. The 73173 is a right-position HVAC air door actuator with an arm-style door linkage, 4 mounting ears, and a 5-terminal pin connector layout.

Key Features

• Four Seasons part number 73173
• HVAC blend door actuator for interior climate control systems
• Arm-style door linkage for air door movement
• 4 mounting ears for secure installation
• 5-terminal pin electrical connection
• Right-side application for select Cadillac HVAC systems

Vehicle Fitment

• Fits 2008-2015 Cadillac CTS, right, air door actuator.
• Fits 2005-2011 Cadillac STS, right, air door actuator.

Detailed Description

The Four Seasons 73173 is an HVAC blend door actuator used to move the internal air door that regulates cabin airflow and temperature distribution. In vehicles such as the Cadillac CTS and Cadillac STS, this component helps the HVAC system route air to the proper vents and maintain consistent climate control response. If the actuator fails, the system may lose the ability to change temperature or direct air correctly.

This part cross-references Global Parts Distributors LLC 1712326 for the same application. The Four Seasons 73173 is also referenced by aftermarket numbers including 604161 and 1573024 for select right-side Cadillac HVAC repairs.

Common Issues This Part May Address

• Airflow stuck on one vent position
• Temperature changes not responding correctly
• Clicking or repeated movement from the HVAC dash area
• Inconsistent cabin heat or cooling distribution
• Loss of right-side air door control

Installation Notes and Tips

Confirm the original actuator uses a right-side position, 5-terminal pin connector, and arm-style linkage before replacement. Compare the mounting ear layout and connector shape to the existing unit to verify proper alignment with the HVAC housing. After installation, cycle the climate controls to allow the system to relearn door positions if required by the vehicle.

Quality Assurance

Four Seasons is a recognized HVAC parts brand with a dedicated Air Door Actuator product line for replacement climate control service. The 73173 is built to match the specified application details for select Cadillac CTS and Cadillac STS models.