{"product_id":"gm-genuine-parts-hvac-mode-door-actuator-for-sierra-silverado-front-oem-fit-3-7-arm-15-73952-89018374","title":"GM GENUINE PARTS HVAC Mode Door Actuator for Sierra \u0026 Silverado — Front OEM Fit, 3.7\" Arm (15-73952 \/ 89018374)","description":"\u003cp\u003e\u003cstrong\u003eGM Genuine Parts 15-73952 (89018374) is an OEM-quality HVAC mode door actuator that replaces the original unit to restore proper air distribution in compatible GM trucks.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf your dashboard vents are stuck on one setting, blowing air to the wrong outlets, or making clicking noises when you change modes, the mode door actuator is often the cause. This GM Genuine Parts actuator is built to the original General Motors specifications for fit and function, designed specifically for certain Sierra and Silverado front HVAC assemblies so you get consistent operation and long life.\u003c\/p\u003e\n\n\u003ch3\u003eWhich vehicles and years is this actuator compatible with?\u003c\/h3\u003e\n\u003cp\u003eThis part fits specific GM full-size truck HVAC applications, including select Sierra and Silverado models. It is commonly used in front HVAC assemblies from the early-to-late 2000s for both standard and extended cab configurations.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eListed fitment includes certain 2003–2006 front HVAC assemblies.\u003c\/li\u003e\n  \u003cli\u003eAlso compatible with select 2008–2009 front HVAC applications.\u003c\/li\u003e\n  \u003cli\u003eDesigned for Sierra and Silverado series full-size trucks without ATC (automatic temperature control).\u003c\/li\u003e\n  \u003cli\u003eCheck your vehicle VIN or parts catalog to confirm exact match before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this actuator restore HVAC performance?\u003c\/h3\u003e\n\u003cp\u003eThe actuator is an electric motor assembly that moves the internal mode doors (flaps) to route air to the dash, floor, or defrost vents. Replacing a failing actuator removes erratic vent behavior, eliminates clicking or grinding noises, and returns reliable mode selection when you change settings.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReplaces worn or stripped gears that cause intermittent operation.\u003c\/li\u003e\n  \u003cli\u003eRestores accurate air distribution between vents (dash, floor, defrost).\u003c\/li\u003e\n  \u003cli\u003eStops repetitive clicking caused by a stuck or misaligned actuator.\u003c\/li\u003e\n  \u003cli\u003eManufactured to GM tolerances for consistent movement and service life.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the important specifications and physical details?\u003c\/h3\u003e\n\u003cp\u003eThe actuator includes an electric motor, gear set, and an actuator arm that connects to the mode door linkage. Knowing the arm length and mounting style helps ensure a correct mechanical fit in the HVAC housing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eActuator arm length: 3.7 inches for correct lever engagement.\u003c\/li\u003e\n  \u003cli\u003eFactory part number references: GM 15-73952 and 89018374.\u003c\/li\u003e\n  \u003cli\u003eDesigned to match original electrical connector and mounting points.\u003c\/li\u003e\n  \u003cli\u003eSold as a single replacement actuator for the front HVAC assembly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan I install this myself and what should I watch for?\u003c\/h3\u003e\n\u003cp\u003eDIY installation is possible for mechanically inclined owners with basic tools: remove lower dash trim, access the HVAC housing, unplug the old actuator, and swap in the new unit. Pay attention to alignment and electrical connections to avoid damage.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTurn off vehicle power and allow system to cool before starting work.\u003c\/li\u003e\n  \u003cli\u003eNote actuator orientation and linkage position before removal.\u003c\/li\u003e\n  \u003cli\u003eVerify actuator arm engages the mode door linkage fully after installation.\u003c\/li\u003e\n  \u003cli\u003eIf uncertain, refer to a vehicle-specific service manual or a professional technician.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this part for? If you own a compatible GMC Sierra or Chevrolet Silverado from the specified model years and you’re experiencing vent misdirection, clicking noises, or non-responsive mode selection, this GM Genuine Parts 15-73952 actuator is the OEM-grade replacement designed for a direct fit and reliable operation. It’s aimed at vehicle owners, independent mechanics, and fleet service shops seeking a factory-spec part to restore normal HVAC functionality without unnecessary modification.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this actuator an original GM part?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the 15-73952 (89018374) is a GM Genuine Parts component built to original equipment specifications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What is the actuator arm length?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The actuator features a 3.7-inch arm designed to match the factory linkage engagement.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"GM GENUINE PARTS","offers":[{"title":"Default Title","offer_id":48083951485086,"sku":"B001S8F2V0","price":86.68,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/gm-genuine-parts-mode-door-actuator-front-view.jpg?v=1785841059","url":"https:\/\/northtrailauto.ca\/products\/gm-genuine-parts-hvac-mode-door-actuator-for-sierra-silverado-front-oem-fit-3-7-arm-15-73952-89018374","provider":"North Trail Auto","version":"1.0","type":"link"}