Dayco 70921 Radiator Coolant Hose
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Dayco

Dayco 70921 Radiator Coolant Hose

Brand Dayco 70921
Position Upper, Lower, Upper - Engine To Radiator, Upper - Pipe To Engine, Lower - Pipe To Engine, and Upper - Pipe To Radiator
Material Epdm
Color Black
End 1 Inside Diameter 2 1/4
End 2 Inside Diameter 2 1/4
Contains Heat Shield N
Contains Protective Sleeve N
End 1 Outside Diameter 2 17/32
Hose Type Single i.d. hose
SAE Specification Sae j20r4 class d-1, sae j1684 type ec
Trunk Height 22 1/2
Fits —

Curved hose design. Helps route coolant smoothly with a clean, factory-style fit.

EPDM construction. Resists heat and coolant exposure for dependable service.

SAE-rated hose. Built to meet SAE J20R4 Class D-1 and SAE J1684 Type EC.

Cross-references ACDelco 22095M, ACDelco 24006L and ACDelco 26017X for the same application. See all 34.

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Curved Radiator Hose for Cooling System Service

Dayco 70921 is a curved radiator coolant hose built for cooling system repairs that require a 2 1/4-inch inside diameter at both ends. Made from EPDM and finished 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.

For Ford truck and industrial cooling system service, Dayco 70921 provides the curved routing needed to connect radiator and engine coolant passages while maintaining a clean, OE-style hose path. The Dayco Curved Radiator Hose line is focused on replacement hoses formed for specific routing needs, making it a practical choice when replacing a worn or cracked coolant hose on Ford, John Deere, or other cross-referenced applications.

Key Features

  • Brand: Dayco
  • Part number: 70921
  • Curved radiator coolant hose for cooling system repair
  • EPDM construction for radiator hose service
  • Black finish for a clean engine-bay appearance
  • 2 1/4-inch inside diameter at both ends
  • Single I.D. hose design
  • Meets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
  • No heat shield and no protective sleeve

Detailed Description

Dayco 70921 is a curved radiator hose engineered for coolant transfer in vehicles and equipment that use a 2 1/4-inch hose connection on both ends. The EPDM rubber construction is suited to radiator hose service, while the curved profile helps maintain proper hose routing in tight engine compartments. This part number is commonly cross-referenced in Ford cooling system applications, including Ford truck service, and also appears in interchange listings for John Deere equipment.

When replacing a radiator coolant hose, matching the inside diameter and hose shape is critical for a secure connection and proper coolant flow. Dayco 70921 is a direct-fit style replacement for applications calling for this curved hose configuration, including Ford F-Series and related cooling system service where the specified dimensions match.

What This Hose Helps Address

  • Coolant leaks from a cracked, hardened, or split radiator hose
  • Restricted coolant flow caused by hose collapse or internal deterioration
  • Improper hose routing in curved cooling system layouts
  • Overheating concerns linked to damaged radiator coolant plumbing
  • Service replacement for Ford truck and John Deere cooling system applications

Installation Notes and Tips

Verify the hose routing, end diameters, and overall formed shape before installation. Inspect hose necks, clamps, and adjoining coolant components for wear or corrosion, and replace any damaged mating surfaces before installing the new hose. Drain coolant as needed, position the hose without twisting, and confirm clearance from moving parts and hot surfaces after installation.

Quality Assurance

Dayco 70921 is built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications for radiator hose applications. The Dayco Curved Radiator Hose line is intended to provide a formed replacement solution for cooling system service where the original hose routing and dimensions must be maintained.

This part cross-references Ford (e.g., C9PJ-8260-D, D6TA-8B273-DA) for the same application.

Related reading

This part fits 0 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
Directly replaces or cross-references 34 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
ACDelco — 22095MACDelco — 24006LACDelco — 26017XACDelco — 26107XCARQUEST — 20401CARQUEST — 20731CARQUEST — 20957CARQUEST — 21418Case — 1289072-C1Duralast — E70921Ford — C9PJ-8260-DFord — D6TA-8B273-DAFord — E4HT-8260-EAGates — 20401Gates — 20731Gates — 20957Gates — 21418General Motors — 722538Goodyear — 60845Goodyear — 66707John Deere — L31795Mack — 11MS3592-M2Massey Ferguson — 535333M1Mopar — BH1628Motorcraft — KM110NAPA — 7224NAPA — 7496NAPA — 7694NAPA — 8115Navistar — 3532993-C2Oliver — 158664APirelli — MR219Pirelli — MR222White — 20423-3206