{"product_id":"four-seasons-73778-hvac-mode-door-actuator-auxiliary","title":"Four Seasons 73778 HVAC Mode Door Actuator - Auxiliary","description":"\u003ch2\u003eHVAC Mode Door Actuator Overview\u003c\/h2\u003e\u003cp\u003eThe Four Seasons 73778 HVAC mode door actuator is built for climate control systems that need precise air door movement. It is a direct-fit style replacement for compatible applications and is identified by part number 73778.\u003c\/p\u003e\u003cp\u003eCompatible With 2016-2023 Mazda CX-9 auxiliary HVAC applications, this actuator uses a cam-style door linkage and a 5-pin terminal layout. The 4-ear mounting design supports secure installation in the HVAC housing.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eCam-style door linkage for controlled air door movement\u003c\/li\u003e\n\u003cli\u003eHVAC air door actuator construction\u003c\/li\u003e\n\u003cli\u003e5-terminal pin configuration\u003c\/li\u003e\n\u003cli\u003e4 mounting ears for secure attachment\u003c\/li\u003e\n\u003cli\u003eFour Seasons part number 73778\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Description\u003c\/h2\u003e\u003cp\u003eFour Seasons 73778 is an HVAC mode door actuator used to control air distribution inside the climate system. In compatible Mazda CX-9 auxiliary applications, it helps direct airflow to the selected vent mode by moving the internal door through the HVAC case. The cam linkage design and 5-pin electrical connection support accurate actuator operation, while the 4-ear mounting pattern provides a stable fit in the assembly. This part cross-references TK4961A70 for the same application.\u003c\/p\u003e\u003ch2\u003eWhat It Is Used For\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRestoring proper airflow direction through the HVAC system\u003c\/li\u003e\n\u003cli\u003eAddressing inconsistent vent mode selection\u003c\/li\u003e\n\u003cli\u003eReplacing a worn or nonresponsive air door actuator\u003c\/li\u003e\n\u003cli\u003eCorrecting HVAC doors that do not move as commanded\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eVerify the connector style, mounting ear layout, and cam linkage match the original actuator before installation. Confirm the auxiliary HVAC application on the vehicle and compare the part number 73778 with the removed unit for proper identification.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eFour Seasons states that its products are engineered and tested for long service life, drawing on more than 50 years of mobile A\/C experience.\u003c\/p\u003e","brand":"Four Seasons","offers":[{"title":"Default Title","offer_id":53519208480949,"sku":"BBRN-73778","price":42.61,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/FS_73778_FRO.jpg?v=1791959874","url":"https:\/\/www.partcatalog.com\/products\/four-seasons-73778-hvac-mode-door-actuator-auxiliary","provider":"PartCatalog","version":"1.0","type":"link"}