Four Seasons 73718 HVAC Mode Door Actuator - Right

Four Seasons 73718 HVAC Mode Door Actuator

The Four Seasons 73718 HVAC mode door actuator restores proper air distribution in the cabin by moving the mode door through the HVAC air door linkage. Built with a gear-style door linkage, this actuator is made for precise control of airflow direction in Lexus climate systems.

Compatible with select Lexus IS300, IS350, IS500, RC F, RC300, RC350, GS350, GS450h, IS200t, and IS250 applications, this Four Seasons HVAC mode door actuator is a direct-fit replacement for vehicles that need accurate dash vent, floor, or defrost air routing. Part number 73718 is engineered for dependable operation in the HVAC system.

Key Features

• HVAC air door actuator for mode door control
• Gear-style door linkage for consistent movement
• 4 mounting ears for secure installation
• 5-terminal pin electrical connection
• Direct replacement for Four Seasons 73718
• Cross-references select OE and aftermarket numbers for the same application

Detailed Description

This HVAC mode door actuator is designed to control the position of the air distribution door inside the climate control housing. On Lexus vehicles, that function determines whether air is directed to the upper vents, floor outlets, or defrost outlets. The Four Seasons 73718 uses a gear-driven design and a 5-pin terminal layout to match the original system configuration on supported applications.

Four Seasons backs this part with more than 50 years of mobile A/C experience and states that its products are engineered and tested for long service life. This part cross-references 8710630500 and ACT2068IM for the same application. Part number 73718 is a practical replacement choice for Lexus HVAC repairs where mode door movement has become inconsistent or inoperative.

What It Helps Fix

• Air stuck at one vent setting
• No change between dash, floor, and defrost modes
• Clicking or binding from the HVAC actuator area
• Incorrect airflow direction in the cabin
• Climate control response issues tied to the mode door

Installation Notes and Tips

Verify the original actuator’s connector style, mounting ear layout, and door linkage before installation. On Lexus IS300, IS350, IS500, RC F, RC300, RC350, GS350, GS450h, IS200t, and IS250 applications, confirm whether the vehicle uses the listed right-side or No. 1 position before ordering. After installation, cycle the HVAC controls to allow the system to relearn actuator position if required by the vehicle.

Quality Assurance

Four Seasons engineers and tests its HVAC components to support reliable operation, drawing on over 50 years of mobile air conditioning experience. The 73718 is built as an OE-style replacement for proper fit and function in supported Lexus climate control systems.