{"product_id":"gates-21603-radiator-coolant-hose","title":"Gates 21603 Radiator Coolant Hose - Upper","description":"\u003ch2\u003eGates 21603 Molded Coolant Hose Overview\u003c\/h2\u003e\u003cp\u003eThe Gates 21603 molded coolant hose is a radiator coolant hose built to OEM-quality specifications for upper cooling-system service. Made from EPDM, it provides the formed shape needed for direct routing in the engine bay on select Chevrolet Astro, GMC Safari, and Chevrolet Camaro applications.\u003c\/p\u003e\u003cp\u003eGates Molded Coolant Hose products are built as application-specific replacement hoses for upper, lower, bypass, heater, and other coolant circuits. This line is engineered to simplify radiator hose replacement by matching the original hose form and fit requirements for the vehicle.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePart number: 21603\u003c\/li\u003e\n\u003cli\u003eBrand: Gates Molded Coolant Hose\u003c\/li\u003e\n\u003cli\u003eRadiator coolant hose for upper hose applications\u003c\/li\u003e\n\u003cli\u003eEPDM construction for coolant-system service\u003c\/li\u003e\n\u003cli\u003eMolded design for formed routing\u003c\/li\u003e\n\u003cli\u003eEnd 1 inside diameter: 1.25 in. (32 mm)\u003c\/li\u003e\n\u003cli\u003eEnd 2 inside diameter: 1.25 in. (32 mm)\u003c\/li\u003e\n\u003cli\u003eCenterline length: 24.8 in. (630 mm)\u003c\/li\u003e\n\u003cli\u003eNo spring and no quick-connect fittings\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Description\u003c\/h2\u003e\u003cp\u003eGates 21603 is a molded radiator coolant hose intended for upper cooling-system routing where a formed hose profile is required. The EPDM material is selected for coolant exposure, while the molded shape helps match the original hose path and connection points. This makes it a practical replacement for vehicles that need a direct-fit upper coolant hose rather than a universal straight hose.\u003c\/p\u003e\u003cp\u003eCompatible With 1987-1990 Chevrolet Astro, upper; 1987-1990 GMC Safari, upper; and 1985-1989 Chevrolet Camaro, upper. For fitment searches, this part is commonly referenced as Gates 21603 radiator coolant hose for Chevrolet Astro upper hose replacement and GMC Safari upper coolant hose replacement.\u003c\/p\u003e\u003cp\u003eThis part cross-references Dayco 71189 for the same application.\u003c\/p\u003e\u003ch2\u003eCommon Problems This Hose Can Address\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eCracked or hardened upper radiator hose material\u003c\/li\u003e\n\u003cli\u003eCoolant leaks at the hose body or connection ends\u003c\/li\u003e\n\u003cli\u003eIncorrect hose routing from a previous repair\u003c\/li\u003e\n\u003cli\u003eCollapsed or misshaped hose sections on formed applications\u003c\/li\u003e\n\u003cli\u003eReplacement needs for radiator and HVAC-compatible coolant and heater hose routing on select Astro and Safari models\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eVerify the hose shape, end diameters, and centerline length against the original part before installation. Inspect adjoining necks, clamps, and coolant passages for wear or corrosion, and confirm the routing matches the vehicle’s upper hose path. Drain coolant as needed before removal, then refill and bleed the cooling system according to the vehicle service procedure.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eGates manufactures this molded coolant hose to OEM-quality specifications for replacement use in the cooling system. The molded construction and application-specific dimensions support accurate fitment on the listed Chevrolet and GMC vehicles.\u003c\/p\u003e","brand":"Gates","offers":[{"title":"Default Title","offer_id":45307247591605,"sku":"BBSC-21603","price":37.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/ZO_21603_Fro.jpg?v=1775145982","url":"https:\/\/www.partcatalog.com\/products\/gates-21603-radiator-coolant-hose","provider":"PartCatalog","version":"1.0","type":"link"}