Dayco 86839 HVAC Heater Hose - Reservoir To Engine

Dayco Small I.D. Heater Hose 86839

Dayco 86839 is a Small I.D. Heater Hose built for reservoir-to-engine coolant routing in select GM applications. It uses EPDM construction and a black finish, with 5/16 in. inside diameter ends and a 23 1/2 in. trunk height for the listed fitments.

Key Features

• EPDM heater hose construction for coolant transfer
• Single I.D. hose design with 5/16 in. inside diameter at both ends
• Black finish for a clean OE-style appearance
• 23 1/2 in. trunk height
• Built to SAE J20R3 Class D-1 and SAE J1684 Type EC specifications
• Dayco part number 86839

Product Details

Dayco’s Small I.D. Heater Hose line focuses on compact coolant hoses used in heater and reservoir-to-engine routing. This hose is specified as a single I.D. hose with 5/16 in. end diameters and 5/8 in. outside diameters, making it a direct match for the listed applications. Dayco 86839 is compatible with 2005-2012 Chevrolet Malibu, reservoir to engine; 2006-2010 Pontiac G6, reservoir to engine; and 2008-2009 Saturn Aura, reservoir to engine. The hose is made from EPDM, a common material for automotive coolant service, and meets SAE J20R3 Class D-1 and SAE J1684 Type EC requirements.

Vehicle Fitment

• Fits 2005-2012 Chevrolet Malibu, reservoir to engine
• Fits 2006-2010 Pontiac G6, reservoir to engine
• Fits 2008-2009 Saturn Aura, reservoir to engine

Common Repair Uses

• Replacing a cracked or hardened heater hose
• Restoring coolant flow between the reservoir and engine
• Addressing coolant seepage at a small-diameter hose connection
• Correcting a hose that no longer seals properly on 5/16 in. fittings
• Servicing a worn hose on a Chevrolet Malibu, Pontiac G6, or Saturn Aura

Installation Notes

Verify the hose routing, end diameters, and overall length before installation. Match the reservoir-to-engine position exactly, and inspect adjoining fittings, clamps, and nearby coolant lines for wear or corrosion. Dayco 86839 should be installed only on the applications listed above, including 2005-2012 Chevrolet Malibu, 2006-2010 Pontiac G6, and 2008-2009 Saturn Aura.

Quality Assurance

This hose is manufactured to SAE J20R3 Class D-1 and SAE J1684 Type EC standards for heater hose service. Dayco 86839 is part of Dayco’s Small I.D. Heater Hose line, which is built around compact coolant hose applications that require precise sizing and dependable material selection.