Four Seasons 37538 HVAC Recirculation Door Actuator - Left, Left Main, Main or Right

Four Seasons 37538 HVAC Air Door Actuator

Four Seasons 37538 is an HVAC recirculation door actuator built for vehicles that use a female door linkage, a 3-ear mounting pattern, and a 4-pin terminal connection. It is a direct-fit style air door actuator for restoring recirculation and mode-door movement in a wide range of GM applications, including Buick Century, Chevrolet Impala, and Pontiac Grand Prix.

The Four Seasons Air Door Actuator line focuses on replacement HVAC control components for temperature and airflow routing. Part number 37538 is a practical choice when the recirculation door stops responding, moves intermittently, or no longer tracks the climate control command.

Key Features

• HVAC recirculation door actuator for air distribution control
• Female door linkage design
• 3 mounting ears for secure installation
• 4-terminal pin electrical connection
• Direct replacement style for select GM HVAC systems
• Cross-reference: Gates 2380

Detailed Description

This Four Seasons 37538 actuator is used to move the HVAC recirculation door so the system can switch between outside air and recirculated cabin air. It is listed for a broad range of vehicles, including Fits 2005 Buick Century, Fits 2004-2005 Chevrolet Classic, Fits 1999-2005 Pontiac Grand Am, and Fits 2001-2003 Pontiac Grand Prix, left or right. It also covers many GM trucks and SUVs such as Chevrolet C1500, GMC K1500, and Cadillac Escalade applications where the recirculation or mode door function is controlled through the HVAC actuator.

For shoppers searching for a 37538 HVAC air door actuator, this part number is commonly used across multiple GM platforms and interchange references. Four Seasons 37538 is a fitment-based replacement for vehicles that need precise door movement to restore cabin airflow control.

What It Helps Fix

• Recirculation door stuck in one position
• Airflow that will not switch between fresh and recirculated air
• HVAC clicking or repeated actuator movement
• Temperature or vent mode response problems tied to the door actuator
• Loss of climate control function in select Buick, Chevrolet, GMC, Oldsmobile, Cadillac, and Pontiac models

Installation Notes and Tips

Verify the connector style, door linkage type, mounting ear count, and position before ordering. Some listed applications note dual-zone climate control or ATC connector differences, so confirm the exact HVAC configuration on the vehicle. Fits 1997-2004 Buick Century, left or right, and Fits 2000-2003 Chevrolet Impala, left or right, only when the listed HVAC notes match the vehicle.

Before installation, compare the original actuator to Four Seasons 37538 and check for proper alignment of the door shaft and electrical connector. After installation, cycle the HVAC controls to confirm smooth door movement and correct recirculation operation.

Quality Assurance

Four Seasons supplies HVAC replacement components for a wide range of OE-style applications. Part number 37538 is built to match the listed actuator style and fitment requirements for the vehicles shown above.