Four Seasons 73181 HVAC Mode Door Actuator

Four Seasons 73181 HVAC Mode Door Actuator

The Four Seasons 73181 HVAC mode door actuator is a direct-fit air door actuator for the climate control system. It is built with a cam-style door linkage, 4 mounting ears, and a 5-pin terminal layout for the specified application.

Compatible with 2005-2007 Cadillac STS HVAC mode door actuator applications, this part helps restore proper air door movement in the heating and air conditioning system. Four Seasons Air Door Actuator products are built for vehicle-specific HVAC service needs, and part number 73181 is listed for the Cadillac STS recirculation door function.

Key Features

• HVAC mode door actuator for air distribution and recirculation control
• Cam-style door linkage for the listed application
• 4 mounting ears for secure installation alignment
• 5-terminal pin configuration
• Direct reference part number: 73181
• Fits 2005-2007 Cadillac STS, N/A

Detailed Description

Four Seasons 73181 is an HVAC Air Door Actuator in the Four Seasons Air Door Actuator line, made for climate control systems that use a cam linkage and 5-pin electrical connection. In the 2005-2007 Cadillac STS, this HVAC mode door actuator controls recirculation door functionality and supports proper airflow routing through the dash HVAC system. If your Cadillac STS has inconsistent vent selection or recirculation door movement, this replacement actuator addresses the mechanical and electrical interface used by the original setup. Part number 73181 is also referenced by cross numbers such as 604173 and 1573022 for the same application.

Common Issues This Part Can Address

• Airflow stuck on one vent setting
• Recirculation door not responding to control input
• Clicking or binding from the HVAC actuator area
• Incorrect air distribution between defrost, panel, and floor modes
• Loss of proper cabin air recirculation control

Installation Notes and Tips

Verify the connector style, mounting ear layout, and cam linkage match the original unit before installation. On 2005-2007 Cadillac STS HVAC mode door actuator service, access is typically through the HVAC housing area, so confirm the actuator position and door alignment before final tightening. After installation, cycle the climate controls through each mode setting to confirm smooth door movement and correct airflow response.

Quality Assurance

Four Seasons supplies HVAC replacement components for vehicle-specific repair applications. Part number 73181 is cataloged for the listed Cadillac STS fitment and cross-references OE-style numbers used for the same HVAC mode door actuator application.