Four Seasons 73156 HVAC Mode Door Actuator

HVAC Mode Door Actuator for GM SUVs

Restore proper airflow control in the cabin with this Four Seasons Air Door Actuator, part number 73156. It is built as an HVAC mode door actuator with a gear-style door linkage, 3 mounting ears, and a 5-pin terminal layout for direct replacement service on supported vehicles.

The Four Seasons Air Door Actuator product line focuses on HVAC control components that manage air distribution inside the dash. This actuator is used to move the mode door so the system can direct air to the panel, floor, or other selected outlets as equipped.

• Gear-style door linkage for HVAC mode door movement
• 3 mounting ears for secure dash installation
• 5-terminal pin configuration
• Direct replacement for Four Seasons 73156 applications
• Cross-references Global Parts Distributors LLC 1712068 for the same application

Detailed Product Overview

Four Seasons 73156 is an HVAC mode door actuator for select Chevrolet, GMC, Saab, Isuzu, Buick, and Oldsmobile vehicles. It is commonly searched as a replacement for a Chevrolet Trailblazer HVAC mode door actuator, GMC Envoy air door actuator, or Buick Rainier HVAC actuator when the dash vents stop responding correctly. This part is also listed for Chevrolet Trailblazer EXT, GMC Envoy XL, GMC Envoy XUV, Chevrolet SSR, Saab 9-7x, Isuzu Ascender, and Oldsmobile Bravada applications.

Compatible vehicle coverage includes Fits 2003-2009 Chevrolet Trailblazer, N/A; Fits 2003-2009 GMC Envoy, N/A; Fits 2005-2009 Saab 9-7x, N/A; Fits 2003-2008 Isuzu Ascender, N/A; Fits 2004-2007 Buick Rainier, N/A; Fits 2004-2006 Chevrolet SSR, N/A; Fits 2003-2006 Chevrolet Trailblazer EXT, N/A; Fits 2003-2006 GMC Envoy XL, N/A; Fits 2004-2005 GMC Envoy XUV, N/A; Fits 2003-2004 Oldsmobile Bravada, N/A.

Common Symptoms This Part Can Address

• Airflow stuck at one dash vent setting
• Temperature or mode changes not responding at the controls
• Clicking or repeated movement from behind the dash
• Air directed to the wrong outlet, such as floor instead of panel
• Intermittent HVAC mode door operation

Installation Notes and Tips

Verify the connector style, mounting ear layout, and door linkage before installation. On these Chevrolet Trailblazer, GMC Envoy, and related platform vehicles, access is typically behind the HVAC case inside the dash area, so confirm the failed actuator location before replacing the part. Compare the original unit to Four Seasons 73156 to ensure the 5-pin terminal arrangement and gear linkage match.

Quality Assurance

Four Seasons supplies HVAC replacement components for service applications, and this actuator is built to match the listed fitment and configuration details for the supported vehicles. Part number 73156 is cataloged for direct replacement use on the specified GM and related platforms.