Dayco 86818 HVAC Heater Hose

Dayco Small I.D. Heater Hose 86818

Dayco 86818 is a small I.D. heater hose built from EPDM and finished in black for heater and coolant routing where a 5/16 in. inside diameter is required at both ends. This single I.D. hose is specified to SAE J20R3 Class D-1 and SAE J1684 Type EC standards for service in HVAC hose applications.

Use this Dayco Small I.D. Heater Hose when replacing formed coolant hose sections on select Ford Windstar, Toyota Highlander, Chevrolet Cavalier, Pontiac Sunfire, Honda Civic, and Honda Civic del Sol applications. The 86818 part number is also a direct reference point for shoppers comparing OE-style heater hose replacements.

Key Features

• EPDM construction for heater hose service
• Black finish for a clean OE-style appearance
• 5/16 in. inside diameter at both ends
• Single I.D. hose design for small coolant routing needs
• Built to SAE J20R3 Class D-1 and SAE J1684 Type EC specifications
• Dayco 86818 identification for accurate ordering and cross-reference

Product Details

Dayco’s Small I.D. Heater Hose line is intended for compact coolant connections where molded or reduced-diameter hose routing is required. This hose is listed for positions including pipe to reservoir, throttle body to thermostat, reservoir to radiator, filler reservoir to radiator, and engine to pipe on the vehicles shown below. If you are replacing a worn heater hose on a Chevrolet Cavalier, Pontiac Sunfire, or Honda Civic, matching the hose diameter and routing position is critical for proper fitment.

This part cross-references ACDelco 16013M and Gates 18225 for the same application.

Vehicle Fitment

• Fits 1999-2003 Ford Windstar, pipe to reservoir; 3/8 in.; small I.D. heater hose.
• Fits 2001-2003 Toyota Highlander, throttle body to thermostat; small I.D. heater hose.
• Fits 1995-2002 Chevrolet Cavalier, reservoir to radiator; small I.D. heater hose.
• Fits 1995-2002 Pontiac Sunfire, reservoir to radiator; small I.D. heater hose.
• Fits 2001 Chevrolet Cavalier, N/A; small I.D. heater hose.
• Fits 1996 Chevrolet Cavalier, filler reservoir to radiator; small I.D. heater hose.
• Fits 1996 Pontiac Sunfire, filler reservoir to radiator; small I.D. heater hose.
• Fits 1992-1995 Honda Civic, engine to pipe; small I.D. heater hose.
• Fits 1993-1995 Honda Civic del Sol, engine to pipe; small I.D. heater hose.

Installation Notes

• Verify the hose path, end diameters, and routing position before installation.
• Match the 5/16 in. inside diameter to the original hose connection points.
• Inspect adjoining pipes, clamps, and fittings for corrosion or wear before reuse.
• Confirm the hose is routed without kinks or sharp bends that could restrict coolant flow.
• Use the vehicle-specific position notes above to confirm the correct application on Ford Windstar, Toyota Highlander, Chevrolet Cavalier, Pontiac Sunfire, Honda Civic, and Honda Civic del Sol models.

Quality Assurance

Dayco manufactures this heater hose to published SAE specifications for HVAC hose service. The EPDM construction and application-specific sizing support consistent replacement selection for small-diameter coolant routing. No warranty information was provided with this product data.