Gates 19666 HVAC Heater Hose

Gates 19666 Molded Heater Hose Overview

The Gates 19666 molded heater hose is an OEM-style coolant hose built for tight engine compartments where a formed routing path matters. It is made from EPDM and is approved for coolant, water, air, and marine applications.

For Chevrolet Express, GMC Savana, C/K truck, and Yukon applications, this molded heater hose supports factory-style routing in heater and auxiliary heater circuits. The Gates Molded Heater Hose line focuses on small I.D. formed hoses that match modern packaging constraints.

Key Features

• Factory-molded, OE-style hose shape for precise routing
• EPDM construction for coolant, water, and air service
• Small inside diameter design for tighter engine bay layouts
• Approved for marine applications
• Centerline length: 15.2 in. (386 mm)
• End 1 inside diameter: 0.72 in. (18 mm)
• End 2 inside diameter: 0.72 in. (18 mm)

Product Details

Gates molded heater hose part number 19666 is built as a formed replacement hose for HVAC heater circuits and related coolant routing. The molded profile helps maintain the original hose path on vehicles where straight hose sections do not follow the factory layout cleanly. This part cross-references Continental 63086 for the same application.

Compatible With Chevrolet Express and GMC Savana vans, plus Chevrolet and GMC C/K trucks, Suburban, Tahoe, Blazer, and Yukon applications listed in the fitment data. It is also listed for heater-to-valve, valve-to-pipe, heater-to-pipe, heater-to-tee, and auxiliary heater pipe-to-auxiliary heater positions across 1989-2002 model years.

Common Problems This Hose Can Address

• Cracked or leaking heater hose at a molded bend
• Incorrect hose routing in a crowded engine compartment
• Loss of heater flow from deteriorated coolant hose material
• Replacement needs for heater-to-pipe or heater-to-valve connections
• Service on vehicles with auxiliary heater plumbing

Installation Notes and Tips

Verify the hose position, end diameters, and centerline length before installation. Some listed applications require cut-to-fit use, especially on vehicles without an auxiliary heater. Confirm the routing against the original hose path on Chevrolet Express, GMC Savana, and related truck or SUV applications before final trimming or placement.

Quality Assurance

Gates manufactures this molded heater hose as an OEM-style replacement built to match factory routing requirements. Part number 19666 is part of the Gates Molded Heater Hose line, which is engineered for formed coolant hose applications in compact engine bays.