Four Seasons 73729 HVAC Mode Door Actuator - Main

HVAC Mode Door Actuator for Lexus LS460 and LS600h

Restore proper air distribution in the cabin with this Four Seasons HVAC mode door actuator. Built for the main position to the cool box, this actuator helps control where conditioned air is directed inside the climate system.

• Four Seasons HVAC air door actuator for the main cool box position
• Door linkage style: arm
• Mounting ear quantity: 4
• Terminal pin quantity: 5
• Direct replacement for Lexus LS460 and Lexus LS600h applications

Detailed Product Overview

Four Seasons part number 73729 is an HVAC mode door actuator engineered for dependable operation in the vehicle climate control system. It is built with an arm-style door linkage and a 5-pin terminal layout, with four mounting ears for secure installation in the designated main position. This actuator is used in 2007-2012 Lexus LS460 and 2008-2012 Lexus LS600h models at the cool box location, where it helps move the air door to the correct position for cabin airflow control. If you are searching for a Lexus LS460 HVAC mode door actuator or a Lexus LS600h air door actuator, 73729 is the relevant replacement part number to verify against your original unit.

Four Seasons draws on more than 50 years of mobile A/C experience and states that its products are engineered and tested for long service life and trouble-free operation. This part cross-references 8710650400 and ACT2079IM for the same application.

Common Problems This Part Can Address

• Incorrect airflow direction from the dash vents
• Air stuck on one outlet setting
• Temperature or mode changes that do not respond correctly
• Clicking or binding from the HVAC actuator area
• Loss of proper air distribution to the cool box circuit

Installation Notes and Tips

Verify the original actuator’s connector style, mounting ear layout, and linkage design before installation. Confirm the part number 73729 against the removed unit and match the vehicle application exactly for 2007-2012 Lexus LS460 and 2008-2012 Lexus LS600h, main position to cool box. After installation, cycle the HVAC controls to confirm the mode door moves smoothly and the airflow changes as expected.

Quality Assurance

Four Seasons backs this actuator with product engineering and testing based on decades of mobile air conditioning experience. The brand positions this component as a repair solution intended to deliver consistent operation in the vehicle HVAC system.