{"product_id":"dayco-70870-radiator-coolant-hose","title":"Dayco 70870 Radiator Coolant Hose","description":"\u003ch2\u003eDayco 70870 Curved Radiator Hose\u003c\/h2\u003e\u003cp\u003eDayco 70870 is a curved radiator coolant hose built for cooling-system service where a 3-inch inside diameter is required at both ends. Made from EPDM rubber in black, this single I.D. hose is specified to SAE J20R4 Class D-1 and SAE J1684 Type EC standards for radiator hose applications.\u003c\/p\u003e\u003cp\u003eFor buyers searching for a Dayco curved radiator hose, 3 inch radiator coolant hose, or Dayco 70870 replacement hose for truck and heavy-duty cooling systems, this part delivers the dimensions and material details needed for a direct match. It is also a practical cross-reference option for applications listed under ACDelco 20114S or Gates 21042.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBrand: Dayco Curved Radiator Hose\u003c\/li\u003e\n\u003cli\u003ePart number: 70870\u003c\/li\u003e\n\u003cli\u003eEPDM construction for coolant-system use\u003c\/li\u003e\n\u003cli\u003eBlack finish\u003c\/li\u003e\n\u003cli\u003e3-inch inside diameter at End 1 and End 2\u003c\/li\u003e\n\u003cli\u003eSingle I.D. hose design\u003c\/li\u003e\n\u003cli\u003eMeets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications\u003c\/li\u003e\n\u003cli\u003eNo heat shield and no protective sleeve\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eProduct Details\u003c\/h2\u003e\u003cp\u003eDayco Curved Radiator Hose 70870 is a molded coolant hose designed for radiator and engine-cooling routing where a curved shape is needed. The EPDM rubber construction is suited to coolant exposure and temperature cycling, while the 12-inch trunk height helps identify the hose profile for replacement matching. This hose is a strong search match for Dayco 70870, curved radiator hose 3 inch, and radiator coolant hose replacement for truck cooling systems.\u003c\/p\u003e\u003cp\u003eWhen comparing fitment by dimensions, verify the hose routing, bend shape, and end diameters against the original part before installation. This part cross-references ACDelco 20114S and Gates 21042 for the same application.\u003c\/p\u003e\u003ch2\u003eCommon Cooling Issues It Can Address\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eCracked or split radiator hose material\u003c\/li\u003e\n\u003cli\u003eCoolant leaks at hose connections\u003c\/li\u003e\n\u003cli\u003eSoftening or swelling from heat and age\u003c\/li\u003e\n\u003cli\u003eRestricted coolant flow from a deteriorated hose\u003c\/li\u003e\n\u003cli\u003eIncorrect hose shape or diameter during replacement\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\u003cp\u003eInspect the radiator neck, water outlet, and clamps before installing Dayco 70870. Confirm the 3-inch inside diameter on both ends, the curved profile, and the 12-inch trunk height against the removed hose to ensure proper routing. Use clean mating surfaces and verify clamp placement after the cooling system is refilled and bled.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eDayco manufactures cooling-system hoses to published SAE specifications, including SAE J20R4 Class D-1 and SAE J1684 Type EC for this part. That specification-based construction supports consistent material and dimensional identification for replacement work.\u003c\/p\u003e","brand":"Dayco","offers":[{"title":"Default Title","offer_id":52412235579573,"sku":"BCWL-70870","price":39.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/DY_70870_Fro.jpg?v=1777786349","url":"https:\/\/www.partcatalog.com\/products\/dayco-70870-radiator-coolant-hose","provider":"PartCatalog","version":"1.0","type":"link"}