Dayco 72399 Radiator Coolant Hose - Upper
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Dayco
 Curved Radiator Hose

Dayco 72399 Radiator Coolant Hose - Upper

Brand Dayco 72399
Position Upper
Color Black
End 1 Inside Diameter 1 5/16
End 1 Outside Diameter 1 21/32
End 2 Inside Diameter 1 5/16
End 2 Outside Diameter 1 21/32
Hose Type Single I.D. Hose
Material EPDM
SAE Specification SAE J20R4 Class D-1, SAE J1684 Type EC
Trunk Height 19 1/2
Product line Curved Radiator Hose
Fits Chevrolet, Pontiac, and Saturn · 11 vehicles

Curved hose design. Helps route coolant smoothly with a compact, formed shape.

EPDM construction. Offers durable rubber performance for cooling-system use.

Single I.D. hose. Provides a consistent inside diameter at both ends.

Cross-references ACDelco 24624L, CARQUEST 23337 and Duralast E72399 for the same application. See all 8.

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Not what you need? See all Radiator Coolant Hose options

Curved Upper Radiator Hose for GM Applications

Dayco 72399 is a curved radiator coolant hose built for upper cooling-system routing on select Chevrolet, Pontiac, and Saturn vehicles. Made from EPDM rubber and finished in black, it follows the OE-style shape needed for a clean fit in the engine bay.

This Dayco Curved Radiator Hose line focuses on formed replacement hoses that match the routing and dimensions required for specific cooling-system layouts. For buyers searching for a 2008-2012 Chevrolet Malibu upper radiator hose or a 2007-2009 Pontiac G6 upper coolant hose, Dayco 72399 provides the correct curved profile and SAE-rated construction.

Key Features

  • Dayco 72399 curved radiator hose for upper cooling-system placement
  • EPDM construction for coolant hose service
  • Black finish
  • Single I.D. hose design
  • 1 5/16 in. inside diameter at both ends
  • 1 21/32 in. outside diameter at both ends
  • Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
  • Formed hose profile with 19 1/2 in. trunk height

Detailed Description

Dayco 72399 is a formed radiator coolant hose engineered for upper radiator routing in select GM vehicles. Its EPDM rubber construction is suited for cooling-system service, while the curved shape helps match the original hose path in applications such as the Chevrolet Malibu, Pontiac G6, and Saturn Aura. If you need a replacement upper radiator hose for a 2008-2012 Chevrolet Malibu or a 2007-2009 Saturn Aura, this part number is built around the dimensions and routing those vehicles require.

This part cross-references ACDelco 24624L and Gates 23337 for the same application.

What It Helps Address

  • Coolant leaks from a cracked or aged upper radiator hose
  • Softening, swelling, or collapse of the original hose
  • Improper hose routing after cooling-system service
  • Loss of coolant flow through the upper radiator connection
  • Fitment issues caused by using a straight hose in a curved application

Installation Notes and Tips

Verify the hose routing against the original part before installation. Confirm the end diameters, curved profile, and upper-position routing match the vehicle application. Inspect hose clamps, radiator necks, and adjoining coolant pipes for wear or corrosion before installing the new hose. After installation, refill and bleed the cooling system according to the vehicle service procedure.

Quality Assurance

Dayco 72399 is manufactured to SAE J20R4 Class D-1 and SAE J1684 Type EC standards for radiator hose applications. The formed EPDM construction supports consistent fit and cooling-system service requirements across the listed Chevrolet Malibu, Pontiac G6, and Saturn Aura applications.

Compatible Vehicles

  • Fits 2008-2012 Chevrolet Malibu, Upper, Curved Radiator Hose
  • Fits 2007-2009 Pontiac G6, Upper, Curved Radiator Hose
  • Fits 2007-2009 Saturn Aura, Upper, Curved Radiator Hose

Related reading

This part fits 11 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2012ChevroletMalibu3.6LV6UpperCurved Radiator Hose
2011ChevroletMalibu3.6LV6UpperCurved Radiator Hose
2010ChevroletMalibu3.6LV6UpperCurved Radiator Hose
2009ChevroletMalibu3.6LV6UpperCurved Radiator Hose
2009PontiacG63.6LV6UpperCurved Radiator Hose
2009SaturnAura3.6LV6UpperCurved Radiator Hose
2008ChevroletMalibu3.6LV6UpperCurved Radiator Hose
2008PontiacG63.6LV6UpperCurved Radiator Hose
2008SaturnAura3.6LV6UpperCurved Radiator Hose
2007PontiacG63.6LV6UpperCurved Radiator Hose
2007SaturnAura3.6LV6UpperCurved Radiator Hose
Directly replaces or cross-references 8 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
ACDelco — 24624LCARQUEST — 23337Duralast — E72399Gates — 23337General Motors — 25779558General Motors — 25779559Goodyear — 66281NAPA — 16075