Four Seasons 73645 HVAC Mode Door Actuator

HVAC Mode Door Actuator for Honda Applications

Four Seasons 73645 is an HVAC mode door actuator built for precise air-door control in select Honda vehicles. It is engineered and tested for dependable operation, with a design focused on restoring proper airflow direction inside the climate control system.

Key Features

• HVAC air door actuator style for mode door control
• Arm-style door linkage for the specified application
• 3 mounting ears for secure installation
• 7 terminal pins for the correct electrical connection
• Backed by Four Seasons’ mobile A/C experience and product testing

Product Details

This Four Seasons HVAC mode door actuator, part number 73645, is used to move the mode door inside the HVAC housing so air is directed to the proper vents. It is a direct-fit replacement for select Honda Insight, Honda CR-V, and Honda Civic models, including Fits 2000-2006 Honda Insight, N/A; Fits 1997-2001 Honda CR-V, N/A, w/o ATC (Automatic Temperature Control); and Fits 1996-2000 Honda Civic, N/A. This part cross-references 79140S04G01 and 604378 for the same application.

Common Problems This Part May Resolve

• Airflow stuck on one vent setting
• Inconsistent vent selection between defrost, panel, and floor modes
• HVAC controls not responding correctly to mode changes
• Improper air distribution inside the cabin
• Noise or binding from a worn mode door actuator

Installation Notes and Tips

• Verify the vehicle is equipped with the listed HVAC configuration before ordering.
• For 1997-2001 Honda CR-V applications, this part is for vehicles without ATC (Automatic Temperature Control).
• Confirm the connector, mounting ear layout, and arm linkage match the original actuator.
• Inspect the mode door and HVAC housing for binding before installing the replacement actuator.

Quality Assurance

Four Seasons engineers and tests its HVAC components to support long-term, trouble-free operation. Part number 73645 is built using the company’s experience in mobile air conditioning and climate control parts.