Four Seasons 73179 HVAC Blend Door Actuator - Auxiliary

Four Seasons 73179 Air Door Actuator

Four Seasons 73179 is an HVAC blend door actuator built for precise air door movement in the climate control system. It uses an arm-style door linkage, a 5-terminal pin layout, and a 4-ear mounting design for a direct-fit service replacement on select vehicles.

Compatible with 2006-2011 Cadillac DTS, Auxiliary, this Four Seasons Air Door Actuator supports the HVAC air door function that directs cabin airflow through the blend door system. The Four Seasons Air Door Actuator line is focused on replacement components for heating and air conditioning control, and part number 73179 is listed for the auxiliary position on the DTS.

Key Features

• HVAC blend door actuator for air distribution control
• Arm-style door linkage for the specified application
• 4 mounting ears for secure installation alignment
• 5-terminal pin electrical connection
• Direct reference part number: 73179
• Cross-reference part numbers include 604169 and 1573181 for the same application

Detailed Description

This Four Seasons HVAC Air Door Actuator is engineered for the auxiliary HVAC position on 2006-2011 Cadillac DTS models. It is used in the climate control system to move the air door that regulates airflow routing, helping the system respond correctly to temperature and vent selection commands. If you are replacing a failed Cadillac DTS blend door actuator, part number 73179 provides the specified linkage, terminal count, and mounting configuration for the application.

What It Can Help Resolve

• Incorrect airflow direction from the HVAC outlets
• Temperature changes that do not match control settings
• Air door movement problems in the auxiliary HVAC circuit
• Clicking or repeated actuator movement from a worn unit
• Loss of proper blend door response in the cabin climate system

Installation Notes and Tips

Verify the auxiliary position and connector style before installation. Compare the existing actuator’s arm linkage, 4-ear mounting pattern, and 5-pin terminal layout to the replacement part number 73179 before removal. After installation, cycle the HVAC controls to confirm smooth air door movement and correct temperature and vent response.

Quality Assurance

Four Seasons supplies HVAC replacement components for service applications, and this actuator is cataloged under the Air Door Actuator product line for the specified Cadillac DTS fitment.