Dayco 87681 HVAC Heater Hose

Dayco Small I.D. Heater Hose 87681

Dayco 87681 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 heater hose is part of the Small I.D. Heater Hose line, a product range focused on direct-fit heater hose routing for vehicles that use smaller diameter coolant connections. For shoppers searching for a heater inlet hose for a Ford Ranger, Mazda B2300, or Toyota Tundra, Dayco 87681 provides a fitment-specific option for the listed applications.

• EPDM construction for heater hose service
• 5/8 in. inside diameter at both ends
• Single I.D. hose design
• Black finish
• Meets SAE J20R3 Class D-1 and SAE J1684 Type EC specifications
• Fits heater inlet, valve to engine, intake manifold to heater, and related heater hose positions listed below

Fitment and Application Details

Fits 2009-2010 Ford Ranger, heater inlet; fits 2009-2010 Mazda B2300, heater inlet; fits 2000-2006 Toyota Tundra, valve to engine. It also fits additional listed applications including 1988 Pontiac Fiero, 1985-1987 Cadillac Commercial Chassis, DeVille, and Fleetwood, plus 1987 Jeep Cherokee and Comanche heater valve locations.

Additional fitment includes 1984-1986 Buick Skyhawk and Chevrolet Cavalier intake manifold to heater routing, 1985-1986 Oldsmobile Firenza intake manifold to heater, 1986 Pontiac Sunbird intake manifold to heater, and earlier heater-to-intake-manifold or pipe-to-intake-manifold applications on Buick, Chevrolet, Oldsmobile, and Pontiac models. Dayco 87681 is also listed for 1982-1984 compact GM applications with air conditioning where noted.

• Helps replace cracked, hardened, or leaking heater hose sections
• Addresses coolant seepage at heater inlet or valve connections
• Restores proper coolant flow between engine and heater circuit
• Supports repair of deteriorated small I.D. hose runs on Ford Ranger and Mazda B2300 applications
• Provides a direct replacement option for Toyota Tundra heater hose routing listed above

Installation Notes

Verify the inside diameter, hose routing, and connection points before installation. This hose is intended for heater circuit use where a 5/8 in. I.D. is specified, and the listed vehicle positions should be matched to the exact application on the vehicle. Inspect clamps, fittings, and adjoining coolant components during service to confirm a proper seal.

Quality Assurance

Dayco 87681 is built to published SAE heater hose specifications and uses EPDM construction for automotive coolant service. This part cross-references Ford (e.g., 1L5Z18472CB) and Gates (e.g., 18836) for the same application.