Dayco 71681 HVAC Heater Hose

Dayco Curved Heater Hose for OE-Style Cooling Service

Dayco 71681 is a curved heater hose built for vehicle cooling and HVAC heater circuit service where a 5/8 in. hose connection is required. Made from EPDM rubber and finished in black, it follows the routing needed for upper-to-tee, tee-to-pipe, and heater-to-valve applications across a wide range of vehicles.

The Dayco Curved Radiator Hose line focuses on formed hose routing for direct replacement applications. This hose uses a single I.D. design with 5/8 in. inside diameter at both ends and meets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications for heater hose service.

Key Features

• EPDM construction for heater and coolant hose service
• Curved hose profile for formed routing
• 5/8 in. inside diameter at both ends
• Black finish for OE-style appearance
• Single I.D. hose design
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC standards
• Dayco 71681 for direct replacement searches

Vehicle Fitment

• Fits 2009-2018 Chevrolet Traverse, Heater - Upper To Tee; Curved Radiator Hose
• Fits 2008-2017 Buick Enclave, Heater - Upper To Tee; Curved Radiator Hose
• Fits 2017 GMC Acadia Limited, Heater - Upper To Tee; Curved Radiator Hose
• Fits 2007-2016 GMC Acadia, Heater - Upper To Tee; Curved Radiator Hose
• Fits 2013-2014 GMC Acadia, Heater To Tee; Top Hose Assy.; Curved Radiator Hose
• Fits 2007-2008 GMC Acadia, Heater To Tee; Top Hose Assy.; Curved Radiator Hose
• Fits 2010-2012 Toyota Camry, Tee To Pipe (Outlet); Curved Radiator Hose
• Fits 2007-2010 Saturn Outlook, Heater To Tee-1; Curved Radiator Hose
• Fits 2002-2006 Jeep Liberty, Pipe-1 To Engine; Curved Radiator Hose
• Fits 2000-2005 Cadillac DeVille, Heater To Pipe; Curved Radiator Hose
• Fits 2001-2005 Mitsubishi Montero, Heater To Pipe; w/Dual Heat & A.C., Top Hose; Curved Radiator Hose
• Fits 2004-2005 Pontiac Bonneville, Heater To Pipe; Curved Radiator Hose
• Fits 2001-2003 Oldsmobile Aurora, Heater To Pipe; Curved Radiator Hose
• Fits 1994-1999 Mazda 626, N/A; Curved Radiator Hose
• Fits 1994-1997 Ford Probe, N/A; Curved Radiator Hose
• Fits 1993-1997 Geo Prizm, Heater To Valve; Curved Radiator Hose
• Fits 1994-1997 Mazda MX-6, N/A; Curved Radiator Hose
• Fits 1993-1997 Toyota Corolla, Heater To Valve; Curved Radiator Hose
• Fits 1993 Ford Probe, N/A; Mfg. After 6/93; Curved Radiator Hose

What This Hose Helps Address

• Coolant leaks at a worn or cracked heater hose
• Restricted coolant flow caused by hose collapse or softening
• Improper hose routing in curved heater hose applications
• Heat-related deterioration in aging EPDM hose assemblies
• Service replacement needs for Chevrolet Traverse, Buick Enclave, and GMC Acadia heater circuits

Installation Notes

Verify the hose routing, end diameters, and connection points before installation. This part number is used in multiple positions, including heater-to-tee and heater-to-pipe layouts, so match the vehicle application and hose path exactly. Inspect adjoining clamps, tees, and pipe ends for corrosion or damage before installing Dayco 71681.

Cross-reference part numbers for the same application include ACDelco 14401S and Ford F32Z-8597-C.

Quality Assurance

Dayco 71681 is manufactured to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications, supporting consistent heater hose performance in OE-style service applications.