{"product_id":"dayco-71603-radiator-coolant-hose","title":"Dayco 71603 Radiator Coolant Hose - Lower","description":"\u003ch2\u003eOverview of Dayco Curved Radiator Hose 71603\u003c\/h2\u003e\u003cp\u003eThe Dayco Curved Radiator Hose 71603 is designed for reliable coolant flow in select BMW and Mercedes-Benz vehicles. Engineered with durable EPDM material, this dual inside diameter hose ensures a precise fit and long-lasting performance for your radiator system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eConstructed from high-quality EPDM for heat and chemical resistance\u003c\/li\u003e\n\u003cli\u003eDual inside diameters: 1 1\/2 inch and 1 5\/8 inch for secure connections\u003c\/li\u003e\n\u003cli\u003eBlack color for standard OEM appearance\u003c\/li\u003e\n\u003cli\u003eMeets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications\u003c\/li\u003e\n\u003cli\u003eTrunk height of 15 inches for proper routing in engine bay\u003c\/li\u003e\n\u003cli\u003eCompatible with BMW 535i, 735i, 735iL and Mercedes-Benz 400SE, 400SEL, 500SEC, 500SEL, CL500, S420, S500 models\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Description\u003c\/h2\u003e\u003cp\u003eThe Dayco Curved Radiator Hose 71603 is a dual inside diameter hose designed to accommodate varying connection sizes, with one end measuring 1 1\/2 inches and the other 1 5\/8 inches. Made from EPDM (ethylene propylene diene monomer), this hose offers excellent resistance to heat, ozone, and coolant chemicals, making it suitable for demanding automotive cooling systems. The hose’s black color matches OEM standards, ensuring a clean and professional look under the hood.\u003c\/p\u003e\u003cp\u003eThis hose complies with SAE J20R4 Class D-1 and SAE J1684 Type EC standards, confirming its suitability for coolant applications and durability under typical operating conditions. With a trunk height of 15 inches, it is designed to fit the specific routing requirements of the listed BMW and Mercedes-Benz models.\u003c\/p\u003e\u003ch2\u003eAbout the Curved Radiator Hose Product Line\u003c\/h2\u003e\u003cp\u003eThe Dayco Curved Radiator Hose line focuses on providing hoses with precise bends and dual inside diameters to accommodate complex radiator and coolant system layouts. This product line is engineered to meet strict SAE specifications, ensuring compatibility and performance in European luxury vehicles such as BMW and Mercedes-Benz. The 71603 part number is a representative example, offering a tailored fit and material quality consistent with the line’s standards.\u003c\/p\u003e\u003ch2\u003eCommon Applications and Issues Addressed\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eReplacement of worn or cracked radiator coolant hoses in BMW 535i, 735i, 735iL\u003c\/li\u003e\n\u003cli\u003eRepair of coolant leaks in Mercedes-Benz 400SE, 400SEL, 500SEC, 500SEL\u003c\/li\u003e\n\u003cli\u003eRestoration of proper coolant flow to prevent engine overheating in CL500, S420, S500\u003c\/li\u003e\n\u003cli\u003eUpgrade to a hose meeting SAE J20R4 Class D-1 for improved durability\u003c\/li\u003e\n\u003cli\u003eAddressing fitment issues caused by incorrect hose diameters or lengths\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eEnsure the hose is routed without kinks or sharp bends to maintain coolant flow\u003c\/li\u003e\n\u003cli\u003eVerify the inside diameters match the radiator and engine fittings before installation\u003c\/li\u003e\n\u003cli\u003eUse appropriate clamps rated for coolant hoses to secure connections\u003c\/li\u003e\n\u003cli\u003eInspect surrounding components for wear or damage during replacement\u003c\/li\u003e\n\u003cli\u003eAllow the engine to cool before removing the old hose to avoid burns\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eDayco manufactures the Curved Radiator Hose 71603 to meet SAE standards, ensuring consistent quality and performance. While specific warranty details are not provided here, Dayco products typically come with manufacturer-backed warranties covering defects in materials and workmanship. For precise warranty information, consult Dayco or authorized distributors.\u003c\/p\u003e","brand":"Dayco","offers":[{"title":"Default Title","offer_id":43391430525109,"sku":"BCWL-71603","price":37.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DY_71603_Fro_35e259da-f9e5-4e91-ac3c-f57c05335e87.jpg?v=1774728394","url":"https:\/\/www.partcatalog.com\/products\/dayco-71603-radiator-coolant-hose","provider":"PartCatalog","version":"1.0","type":"link"}