Dayco 86836 HVAC Heater Hose - Coolant Reservoir or Radiator To Engine

Dayco Small I.D. Heater Hose 86836

Dayco 86836 is a Small I.D. Heater Hose built from EPDM for coolant and heater circuit service where a compact hose diameter is required. It is a black, single I.D. hose with SAE J20R3 Class D-1 and SAE J1684 Type EC compliance, making it a direct-fit option for a wide range of GM trucks, SUVs, vans, and select Toyota and Saab applications.

The Dayco Small I.D. Heater Hose line is focused on replacement hoses with the correct inside diameter, outside diameter, and material construction for vehicle-specific cooling system routing. For buyers searching for a heater hose for Chevrolet Silverado 1500, GMC Sierra 1500, or Toyota Yaris coolant reservoir service, part number 86836 provides a fitment-driven solution.

Key Features

• EPDM construction for heater and coolant hose service
• Black single I.D. hose design
• End 1 inside diameter: 1/4 in.
• End 2 inside diameter: 9/32 in.
• Outside diameter: 17/32 in. at both ends
• Meets SAE J20R3 Class D-1 and SAE J1684 Type EC specifications
• No heat shield and no protective sleeve

Detailed Description

Dayco 86836 is engineered as a small inside diameter heater hose for cooling-system and heater-circuit routing where precise hose sizing matters. The EPDM rubber construction is suited for hot coolant exposure, while the single I.D. hose profile supports applications that call for a compact, vehicle-specific replacement hose. This part number is used across many GM platforms, including Chevrolet Silverado 1500, GMC Sierra 1500, Chevrolet Tahoe, and GMC Yukon, along with select Cadillac Escalade applications and Toyota Yaris coolant reservoir service.

This part cross-references Gates 18126 and NAPA 10126 for the same application. If you are replacing a worn hose on a Chevrolet Silverado 2500 HD, GMC Sierra 3500, or Toyota Yaris, Dayco 86836 is built to match the listed fitment and hose dimensions.

Common Problems This Hose Can Address

• Cracked or hardened heater hose material
• Coolant seepage at a small-diameter hose connection
• Softening or swelling from age and heat cycling
• Restricted coolant flow caused by a deteriorated hose
• Service replacement for a damaged coolant reservoir or heater hose line

Installation Notes and Tips

Verify the hose routing, end diameters, and application position before installation. This hose is listed for positions including Coolant Reservoir, Radiator To Engine, and N/A depending on vehicle application. Confirm the original hose length and connection points on the vehicle before removal, especially on Chevrolet Express, GMC Savana, and full-size GM truck platforms.

Compatible With 1999-2014 Chevrolet Silverado, 1999-2014 GMC Sierra, 2000-2014 Chevrolet Tahoe/Suburban, 2002-2014 Cadillac Escalade, and 2007-2018 Toyota Yaris applications listed in the fitment data.

Quality Assurance

Dayco manufactures this hose to SAE J20R3 Class D-1 and SAE J1684 Type EC specifications for replacement cooling-system service. The EPDM material and application-specific sizing support consistent fitment across the listed vehicle coverage.