Dayco 72743 Radiator Coolant Hose - Upper
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Dayco
 Curved Radiator Hose

Dayco 72743 Radiator Coolant Hose - Upper

Brand Dayco 72743
Position Upper
Color Black
End 1 Inside Diameter 1 17/32
End 1 Outside Diameter 1 5/8
End 2 Inside Diameter 1 17/32
End 2 Outside Diameter 1 5/8
End 3 Inside Diameter 3/4
End 3 Outside Diameter 1 1/8
End 4 Inside Diameter 1/2
End 4 Outside Diameter 3/4
Hose Type Branched Hose
Material EPDM
SAE Specification SAE J20R4 Class D-1, SAE J1684 Type EC
Trunk Height 12
Product line Curved Radiator Hose
Fits BMW · 14 vehicles

Branched hose. Multiple branches route coolant through a single molded hose.

EPDM construction. Resists heat and coolant exposure for dependable cooling-system service.

Curved radiator hose. Formed shape helps simplify routing and installation.

Cross-references ACDelco 22832M, BMW 17.12.7.546.064 and Duralast D72743 for the same application. See all 5.

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Not what you need? See all Radiator Coolant Hose options

Dayco 72743 Curved Radiator Hose Overview

Dayco 72743 is a branched radiator coolant hose built for upper cooling system routing on select BMW applications. Formed from EPDM and finished in black, it is shaped to match the factory-style hose path and connection points used in the cooling circuit.

Compatible with 2006-2010 BMW 525i, 525xi, 530i, 530xi, 528i, 528i xDrive, and 528xi upper radiator hose applications, this Dayco Curved Radiator Hose supports direct replacement service for the listed vehicles.

Key Features

  • Part number: 72743
  • Dayco Curved Radiator Hose / branched hose design
  • EPDM construction for cooling-system hose service
  • Black exterior finish
  • End 1 inside diameter: 1 17/32 in.; End 2 inside diameter: 1 17/32 in.
  • End 3 inside diameter: 3/4 in.; End 4 inside diameter: 1/2 in.
  • SAE J20R4 Class D-1 and SAE J1684 Type EC specification listing
  • No heat shield and no protective sleeve

Product Details

Dayco 72743 is engineered as a curved radiator hose with branched routing to match the upper coolant hose layout on the listed BMW models. The EPDM hose material is selected for standard coolant-system service, while the molded shape helps maintain the correct routing between the radiator and engine-side connections. This part cross-references BMW 17.12.7.546.064 and Gates 24332 for the same application.

Use Dayco 72743 when replacing a worn, cracked, swollen, or leaking upper radiator hose on a BMW 525i, 530i, or 528i application. The hose dimensions and branched configuration are important for proper fitment in the cooling system.

Common Replacement Reasons

  • Coolant seepage at the hose body or connection points
  • Cracking, hardening, or swelling from heat and age
  • Loss of coolant from a damaged upper radiator hose
  • Incorrect routing or fitment after prior hose replacement
  • Cooling-system service on BMW upper hose applications

Installation Notes

Verify the vehicle year, model, and upper hose routing before installation. Compare the hose end diameters and branched layout to the removed part to confirm match-up. Inspect adjoining clamps, radiator necks, and engine fittings for wear or corrosion before installing the new hose. Fill and bleed the cooling system according to BMW service procedures after replacement.

Quality Assurance

Dayco manufactures this hose to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications listed for the part. The EPDM construction and molded configuration support consistent cooling-system replacement service on the specified BMW applications.

Related reading

This part fits 14 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelTransmissionLitersCylindersPositionNotes
2010BMW528iAutomatic——UpperCurved Radiator Hose
2010BMW528i xDriveAutomatic——UpperCurved Radiator Hose
2009BMW528iAutomatic——UpperCurved Radiator Hose
2009BMW528i xDriveAutomatic——UpperCurved Radiator Hose
2008BMW528iAutomatic——UpperCurved Radiator Hose
2008BMW528xiAutomatic——UpperCurved Radiator Hose
2007BMW525iAutomatic3.0LL6UpperCurved Radiator Hose
2007BMW525xiAutomatic——UpperCurved Radiator Hose
2007BMW530iAutomatic——UpperCurved Radiator Hose
2007BMW530xiAutomatic——UpperCurved Radiator Hose
2006BMW525iAutomatic3.0LL6UpperCurved Radiator Hose
2006BMW525xiAutomatic——UpperCurved Radiator Hose
2006BMW530iAutomatic——UpperCurved Radiator Hose
2006BMW530xiAutomatic——UpperCurved Radiator Hose
Directly replaces or cross-references 5 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
ACDelco — 22832MBMW — 17.12.7.546.064Duralast — D72743Gates — 24332Rein — CHR0458