Dayco 72021 Radiator Coolant Hose - Lower
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Dayco
 Curved Radiator Hose

Dayco 72021 Radiator Coolant Hose - Lower

Brand Dayco 72021
Position Lower
Color Black
End 1 Inside Diameter 1 7/16
End 2 Inside Diameter 1 7/16
End 3 Inside Diameter 5/8
Hose Type Branched Hose
Material EPDM
SAE Specification SAE J20R4 Class D-1, SAE J1684 Type EC
Trunk Height 17
Product line Curved Radiator Hose
Fits Ford and Mazda · 22 vehicles

Curved hose design. Routes coolant smoothly with a branched layout.

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

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

Cross-references ACDelco 22340M, ACDelco 24603L and CARQUEST 22351 for the same application. See all 23.

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Dayco Curved Radiator Hose for Ranger and B3000

The Dayco 72021 is a branched lower radiator coolant hose built for specific Ford Ranger and Mazda B3000 applications. Made from EPDM and finished in black, it follows the curved routing needed to connect cooling system components cleanly in the engine bay.

Key Features

  • EPDM construction for coolant hose service
  • Black finish for a factory-style appearance
  • Branched hose design for the specified cooling system layout
  • 1 7/16 in. inside diameter at End 1
  • 1 7/16 in. inside diameter at End 2
  • 5/8 in. inside diameter at End 3
  • Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
  • Trunk height: 17 in.

Detailed Description

Dayco 72021 is a curved radiator hose for lower-position cooling system routing on 1998-2008 Ford Ranger and 1998-2008 Mazda B3000 models. This branched hose uses EPDM rubber to handle coolant exposure and the demands of underhood temperature cycling. The hose dimensions and curved shape support a direct replacement for the original lower radiator hose layout on these applications. This part cross-references Ford 2L5Z-8286-AA and Motorcraft KM3429 for the same application.

Dayco’s Curved Radiator Hose line focuses on application-specific hose geometry and material selection for cooling system service. For Ford Ranger and Mazda B3000 lower radiator hose replacement, the Dayco 72021 provides the correct branched configuration and OE-style fitment profile.

Common Problems This Hose Can Address

  • Coolant leaks from a cracked or aged lower radiator hose
  • Softening, swelling, or collapse of the original hose
  • Improper hose routing after cooling system repair
  • Loss of coolant from worn branch connections
  • Fitment issues caused by using a universal hose in a shaped application

Installation Notes and Tips

Verify the hose routing, end diameters, and lower-position layout before installation. Inspect adjoining clamps, radiator necks, and engine fittings for wear or corrosion so the new hose seals properly. Confirm the vehicle application against the listed fitment before ordering.

  • Fits 1998-2008 Ford Ranger, lower
  • Fits 1998-2008 Mazda B3000, lower

Quality Assurance

This radiator coolant hose is manufactured to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications for cooling system service.

Related reading

This part fits 22 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2008FordRanger3.0LV6LowerCurved Radiator Hose
2008MazdaB3000——LowerCurved Radiator Hose
2007FordRanger3.0LV6LowerCurved Radiator Hose
2007MazdaB3000——LowerCurved Radiator Hose
2006FordRanger3.0LV6LowerCurved Radiator Hose
2006MazdaB3000——LowerCurved Radiator Hose
2005FordRanger3.0LV6LowerCurved Radiator Hose
2005MazdaB3000——LowerCurved Radiator Hose
2004FordRanger3.0LV6LowerCurved Radiator Hose
2004MazdaB3000——LowerCurved Radiator Hose
2003FordRanger3.0LV6LowerCurved Radiator Hose
2003MazdaB3000——LowerCurved Radiator Hose
2002FordRanger3.0LV6LowerCurved Radiator Hose
2002MazdaB3000——LowerCurved Radiator Hose
2001FordRanger3.0LV6LowerCurved Radiator Hose
2001MazdaB3000——LowerCurved Radiator Hose
2000FordRanger3.0LV6LowerCurved Radiator Hose
2000MazdaB3000——LowerCurved Radiator Hose
1999FordRanger3.0LV6LowerCurved Radiator Hose
1999MazdaB3000——LowerCurved Radiator Hose
1998FordRanger3.0LV6LowerCurved Radiator Hose
1998MazdaB3000——LowerCurved Radiator Hose
Directly replaces or cross-references 23 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
ACDelco — 22340MACDelco — 24603LCARQUEST — 22351CARQUEST — 23269Duralast — E72021Ford — 2L5Z-8286-AAFord — 2L5Z-8286-ABFord — 4L54-8B273-AAFord — 7L54-8B273-ABFord — F87A-8B273-AAFord — F87A-8B273-ABFord — F87Z-8286-AAFreshstart — 1188Freshstart — 62406Gates — 22351Gates — 23269Goodyear — 62258Goodyear — 62406Motorcraft — KM3429Motorcraft — KM4713Motorcraft — KM4817NAPA — 8984NAPA — 16007