{"product_id":"acdelco-molded-branched-heater-hose-18221l-black-gm-oe-style-direct-fit-epdm","title":"ACDelco Molded Branched Heater Hose 18221L — Black, GM OE-Style Direct-Fit EPDM","description":"\u003cp\u003e\u003cstrong\u003eThe ACDelco Professional 18221L is a factory-molded, GM OE-style branched heater hose engineered for direct-fit coolant and heater connections in modern tight engine bays.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eDesigned as a premium aftermarket replacement, this molded heater hose mirrors GM original equipment shapes to simplify installation and restore proper coolant routing. Constructed from a proprietary EPDM rubber blend, the hose resists electrochemical degradation and stays flexible across a broad temperature range, making it suitable for coolant, water, and air applications — including many marine uses. It is not rated for fuel or oil transfer.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this molded branched heater hose make installation easier?\u003c\/h3\u003e\n\u003cp\u003eThe 18221L is formed to the same contours as GM OE parts so it installs without twisting, buckling, or excessive stress at connection points. That precise shaping reduces the need for adjustments during replacement and shortens labor time.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFactory-molded GM OE-style shape for direct-fit installation\u003c\/li\u003e\n  \u003cli\u003eProtective sleeve where required to match original fit and routing\u003c\/li\u003e\n  \u003cli\u003eMinimizes bending and strain at hose ends to prevent leaks\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and temperature range does this hose use and support?\u003c\/h3\u003e\n\u003cp\u003eACDelco uses a proprietary EPDM rubber blend for flexibility and durability. The hose is temperature-rated from −40°F to 275°F (−40°C to 135°C), suitable for standard engine coolant systems and many marine cooling applications.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eProprietary EPDM composition for extended life and pliability\u003c\/li\u003e\n  \u003cli\u003eResists electrochemical degradation (ECD), a common failure mode\u003c\/li\u003e\n  \u003cli\u003eTemperature rating supports a wide range of operating conditions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich systems and vehicles can this hose be used on?\u003c\/h3\u003e\n\u003cp\u003eThe 18221L covers many GM-based heater and coolant routing needs and is one of many part numbers designed to reduce inventory while maximizing vehicle coverage. It can be used for coolant, water, and air lines where a molded branched hose is required.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eGM OE-style part for many GM applications and compatible replacements\u003c\/li\u003e\n  \u003cli\u003eApproved for marine cooling use when application requires it\u003c\/li\u003e\n  \u003cli\u003eNot suitable for fuel or oil transfer systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the key dimensions and features to confirm fit?\u003c\/h3\u003e\n\u003cp\u003eThe hose includes measured diameters and branch sizes to match original equipment routing. Confirm vehicle-specific fitment using dimensions and part cross-reference before installation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDiameter range and branch sizes: 1 in x 3\/4 in x 5\/8 in x 5\/8 in\u003c\/li\u003e\n  \u003cli\u003eOverall length approximately 19 3\/32 in to align with factory routing\u003c\/li\u003e\n  \u003cli\u003eCovered by ACDelco’s Professional line standards for fit, form, and function\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The ACDelco Professional 18221L molded branched heater hose is aimed at technicians, independent repair shops, and DIY mechanics who need a reliable, OE-style replacement for GM and compatible vehicles. If you require a direct-fit coolant or heater hose that resists degradation, simplifies replacement in tight engine compartments, and matches GM routing, this hose is an appropriate choice. Always verify vehicle application and measurements before purchase to ensure proper fit and safe operation.\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: Can the 18221L be used for fuel or oil?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. The 18221L is designed for coolant, water, and air applications only, not for fuel or oil transfer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What temperature range does this hose support?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It is rated from −40°F to 275°F (−40°C to 135°C), suitable for typical engine cooling and many marine uses.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"ACDelco","offers":[{"title":"Default Title","offer_id":48084107493534,"sku":"B000C9DV8C","price":78.61,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/acdelco-18221l-front-packaging.jpg?v=1785846521","url":"https:\/\/northtrailauto.ca\/products\/acdelco-molded-branched-heater-hose-18221l-black-gm-oe-style-direct-fit-epdm","provider":"North Trail Auto","version":"1.0","type":"link"}