Dayco 86123 HVAC Heater Hose

Dayco Small I.D. Heater Hose 86123

Dayco 86123 is a Small I.D. Heater Hose built for heater circuit service where a 5/8 in. inside diameter is required at both ends. Made from EPDM and finished in black, it is specified to SAE J20R3 Class D-1 and SAE J1684 Type EC standards for heater hose applications.

This Dayco Small I.D. Heater Hose line is used for direct-fit heater hose routing in vehicles that need a single I.D. hose profile. The 86123 part number is a practical match for common heater outlet, heater inlet, heater-to-pipe, heater-to-connector, and heater-to-valve locations across select Toyota, Honda, Chevrolet, Buick, Pontiac, GMC, and Hyundai applications.

Key Features

• EPDM construction for heater hose service
• Black finish for OE-style appearance
• 5/8 in. inside diameter at both ends
• Single I.D. hose design
• Meets SAE J20R3 Class D-1 and SAE J1684 Type EC specifications
• Dayco 86123 part number for heater hose replacement lookup

Vehicle Fitment

• Fits 2012-2017 Toyota Camry, Heater To Connector, Top Hose; Small I.D. Heater Hose
• Fits 2009-2015 Toyota Venza, Heater Outlet, Small I.D. Heater Hose
• Fits 2012-2014 Honda CR-V, Heater Inlet, Small I.D. Heater Hose
• Fits 2000-2005 Buick Century, Heater To Pipe (Upper), Small I.D. Heater Hose
• Fits 2000-2003 Chevrolet Impala, Heater To Pipe (Upper), Small I.D. Heater Hose
• Fits 2000-2003 Chevrolet Monte Carlo, Heater To Pipe (Upper), Small I.D. Heater Hose
• Fits 2000-2003 Pontiac Grand Prix, Heater To Pipe (Upper), Small I.D. Heater Hose
• Fits 2000-2001 Chevrolet Lumina, Heater To Pipe (Upper), Small I.D. Heater Hose
• Fits 2000 Chevrolet Impala, Heater Outlet, Top Hose; Small I.D. Heater Hose
• Fits 1993-1997 Honda Accord, Heater Outlet, Small I.D. Heater Hose
• Fits 1993 Chevrolet G20, Heater To Valve, w/A.C., w/o Aux. Heater; Small I.D. Heater Hose
• Fits 1993 Chevrolet G30, Heater To Valve, w/A.C., w/o Aux. Heater; Small I.D. Heater Hose
• Fits 1993 GMC G2500, Heater To Valve, w/A.C., w/o Aux. Heater; Small I.D. Heater Hose
• Fits 1993 GMC G3500, Heater To Valve, w/A.C., w/o Aux. Heater; Small I.D. Heater Hose
• Fits 1990-1993 Honda Accord, Heater To Pipe, Small I.D. Heater Hose

What It Helps Address

• Cracked or hardened heater hose sections
• Coolant seepage at heater hose connections
• Restricted heater flow from deteriorated hose material
• Incorrect hose sizing at 5/8 in. heater ports
• Replacement needs for heater outlet, inlet, pipe, connector, or valve routing

Installation Notes

Verify the hose path, end diameters, and connection points before installation. This hose is a single I.D. design with 5/8 in. inside diameter at both ends, so it should be matched to the vehicle’s heater circuit routing and port size. Confirm the application against the vehicle’s heater outlet, heater inlet, heater-to-pipe, heater-to-connector, or heater-to-valve location before service.

For search and catalog reference, Dayco 86123 is commonly associated with heater hose replacement on Toyota Camry, Toyota Venza, and Honda CR-V applications, along with select Honda Accord, Chevrolet Impala, and Pontiac Grand Prix heater hose locations.

Quality Assurance

Dayco specifies this hose to SAE J20R3 Class D-1 and SAE J1684 Type EC standards, supporting heater hose use in automotive HVAC coolant circuits. The EPDM construction and OE-style black finish align with common replacement requirements for heater hose service.