Dayco 86831 HVAC Heater Hose - Engine To Pipe, Engine To Throttle Body or Reservoir To Pipe

Dayco Small I.D. Heater Hose 86831

Dayco 86831 is a Small I.D. Heater Hose built for HVAC heater hose routing where a compact 5/16 in. inside diameter is required. Made from EPDM and finished in black, it is specified for coolant transfer in select Toyota, Scion, and Volkswagen applications, including Toyota Camry, Toyota Solara, Toyota Highlander, Scion tC, and related fitments.

Key Features

• EPDM construction for heater hose service
• Black finish for a clean OE-style appearance
• 5/16 in. inside diameter at both ends
• 5/8 in. outside diameter at both ends
• Single I.D. hose design for small-diameter coolant routing
• Meets SAE J20R3 Class D-1 and SAE J1684 Type EC specifications

Product Details

This Dayco Small I.D. Heater Hose is engineered for HVAC hose applications that require a precise small-bore connection. The EPDM rubber construction is suited for coolant circulation in heater and bypass-style routing, while the SAE J20R3 Class D-1 and SAE J1684 Type EC specifications provide a clear reference for hose construction and performance standards. Dayco 86831 is a direct-fit style hose for vehicles such as the 2002-2009 Toyota Camry, 2002-2008 Toyota Solara, 2004-2007 Toyota Highlander, and 2005-2010 Scion tC. This part cross-references Toyota 16261-0H010 and 16261-28050 for the same application.

What It Helps Address

• Cracked or hardened heater hose material
• Coolant seepage at a small-diameter hose connection
• Restricted heater coolant flow from deteriorated hose walls
• Incorrect hose sizing during HVAC hose replacement
• Service replacement for Toyota Camry, Toyota Solara, Toyota Highlander, and Scion tC heater hose routing

Installation Notes and Tips

Verify the hose path, end diameters, and routing position before installation. This hose is listed for positions including N/A, Reservoir To Pipe, Engine To Throttle Body, and Engine To Pipe, depending on the vehicle application. Confirm the vehicle year and engine-side routing against the original hose before trimming or clamping. Dayco 86831 is also listed for select 1999-2001 Volkswagen Golf and Jetta reservoir-to-pipe routing, plus 1991-1995 Toyota and Lexus-style engine-side heater hose connections where the specified dimensions match.

Quality Assurance

Dayco manufactures this heater hose to SAE J20R3 Class D-1 and SAE J1684 Type EC standards, supporting consistent material and dimensional requirements for HVAC coolant hose service.