{"product_id":"coolant-heater-core-bypass-hose-loops-crossover-for-ls1-lsx-ls2-ls3-lq4-car-radiator-hose-accessory","title":"Heater Core Bypass Hose Thickened EPDM for Chevy LS1 LS2 LS3 LSX LQ4","description":"\u003cdiv\u003e\n\u003cp\u003eUpgrade your LS engine’s cooling performance with a thickened EPDM heater core bypass hose engineered for direct OEM replacement and long-term thermal stability.\u003c\/p\u003e\n\u003ch2\u003eMain Description\u003c\/h2\u003e\n\u003cp\u003eThis precision-molded coolant crossover loop connects directly to the water pump, routing fluid efficiently through the heater core supply and return channels. Factory rubber tubes frequently harden or swell under repeated heat cycles, restricting cabin warmth and trapping air pockets in the cooling circuit. This reinforced replacement restores consistent coolant circulation while maintaining precise engine operating temperatures. Constructed from heavy-duty EPDM rubber, it resists degradation from hot antifreeze, oil mist, and fuel vapors without losing elasticity. The tapered internal diameter bridges 5\/8-inch and 3\/4-inch ports, delivering a secure, leak-resistant seal across GM LS and LT platform builds.\n\u003c\/p\u003e\n\u003ch2\u003eBenefits \u0026amp; Tips\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eWipe mating water pump surfaces clean of old silicone or corrosion before installation to ensure the rubber grips evenly across the entire circumference.\u003c\/li\u003e\n\u003cli\u003eApply a thin layer of high-temperature silicone grease to the hose barb areas during fitting to reduce friction and protect against future clamp galling.\u003c\/li\u003e\n\u003cli\u003eBleed the air lock thoroughly after refilling with fresh glycol-based coolant to eliminate overheating spikes during initial drive cycles.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eMaterial:\u003c\/b\u003e Thickened EPDM Rubber\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eHorse End IDs:\u003c\/b\u003e Tapered 5\/8-inch to 3\/4-inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eDesign:\u003c\/b\u003e U-shaped coolant crossover bypass\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCompatibility:\u003c\/b\u003e GM Chevrolet \u0026amp; Pontiac LS\/LT Series (Gen 3, 4, 5)\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eEngine Models:\u003c\/b\u003e LS1, LS2, LS3, LSX, LQ4, LT variants (1998 onward)\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eChemical Resistance:\u003c\/b\u003e Coolant, oil, and fuel stable\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eOrigin:\u003c\/b\u003e Mainland China\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePackage Includes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 x U-shaped Heater Core Bypass Hose\u003c\/li\u003e\n\u003cli\u003e2 x Stainless Steel Clamp Sets\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWarnings \u0026amp; Reminders\u003c\/h2\u003e\n\u003cp\u003eConfirm your water pump features dual ports measuring exactly 5\/8-inch and 3\/4-inch before purchase. This component serves exclusively as a plumbing bridge and does not replace the factory bypass tube casting. Always pressurize and test the entire cooling loop after assembly to verify zero leakage prior to regular operation.\u003c\/p\u003e\n\u003cp\u003eAll electronic and mechanical equipment, devices and machines sold by InterCyprus to EU countries are CE certified and carry a two year warranty.\u003c\/p\u003e\n\u003cp\u003eServing independent builders since 2002, intercyprus.com delivers factory-accurate dimensions and transparent material breakdowns for dependable everyday performance.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"InterCyprus Trading Ltd","offers":[{"title":"black","offer_id":55111908491606,"sku":"1005010382195470-black","price":24.97,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0530\/0604\/1274\/files\/S69c71fc47dd94615b4f3514daad5a453a.webp?v=1787816031","url":"https:\/\/www.intercyprus.com\/products\/coolant-heater-core-bypass-hose-loops-crossover-for-ls1-lsx-ls2-ls3-lq4-car-radiator-hose-accessory","provider":"InterCyprus Trading Ltd","version":"1.0","type":"link"}