Dayco 86109 HVAC Heater Hose

Dayco Small I.D. Heater Hose 86109

Dayco 86109 is a Small I.D. Heater Hose built for heater circuit service where a compact, straight hose connection is required. Made from EPDM and finished in black, it is specified to SAE J20R3 Class D-1 and SAE J1684 Type EC for heater hose applications.

This Dayco Small I.D. Heater Hose line is focused on direct-fit heater hose routing for vehicles that use smaller inside diameter connections at the heater inlet, tee, or pipe connection. For Nissan Frontier, Nissan Xterra, Nissan Pathfinder, and other listed applications, 86109 provides the correct hose type and size for the specified connection point.

Key Features

• EPDM construction for heater hose service
• Black finish for a clean OE-style appearance
• 23/32 in. inside diameter at both ends
• Single I.D. hose design for small-diameter heater connections
• Meets SAE J20R3 Class D-1 and SAE J1684 Type EC specifications
• Compatible with listed heater inlet, tee to pipe, tee to engine, and pipe-to-heater positions

Detailed Description

Dayco 86109 is an HVAC heater hose designed for small inside diameter coolant routing in the heater circuit. The EPDM hose material is commonly used in automotive cooling and heating systems because it is suited to coolant exposure and underhood temperature conditions. With a 23/32 in. inside diameter on both ends, this hose is intended for direct replacement where the vehicle calls for a small I.D. heater hose connection.

Fitment includes 2005-2019 Nissan Frontier, tee to pipe; 2014-2015 Nissan Xterra, connector to heater; 2008-2012 Nissan Pathfinder, tee to engine; 2009-2012 Suzuki Equator, heater inlet; 2006-2010 Chevrolet Malibu, heater inlet; 2008-2010 Pontiac G6, lower; 2008-2009 Saturn Aura, heater inlet; and 1993-1997 Cadillac Seville, heater inlet. This part cross-references Gates 19733 and NAPA 11733 for the same application.

What It Helps Address

• Cracked or hardened heater hose material
• Coolant seepage at a small I.D. hose connection
• Restricted heater flow caused by a deteriorated hose
• Incorrect hose size at the heater inlet or pipe connection
• Service replacement for aging HVAC heater hose routing

Installation Notes and Tips

Verify the hose routing, connection style, and inside diameter before installation. Match the listed position exactly, such as tee to pipe, connector to heater, heater inlet, or lower, because the same vehicle may use different hose locations. Inspect adjoining pipes, tees, and heater core fittings for corrosion or damage before installing Dayco 86109.

For fitment searches, this part is commonly referenced for Nissan Frontier heater hose replacement, Nissan Xterra heater inlet hose service, and Nissan Pathfinder small I.D. heater hose applications. It is also listed for Chevrolet Malibu, Pontiac G6, Saturn Aura, Saturn Vue, Cadillac Eldorado, Cadillac DeVille, and Cadillac Seville heater circuit service.

Quality Assurance

Dayco manufactures this hose to published SAE heater hose specifications, including SAE J20R3 Class D-1 and SAE J1684 Type EC. Those standards help define material and performance requirements for automotive heater hose applications.