Gates 19663 HVAC Heater Hose - Heater To Water Pump or Lower - Reservoir To Tee

Gates 19663 Molded Heater Hose Overview

The Gates 19663 molded heater hose is an OEM-style coolant hose built for tight engine compartments where a straight hose will not route correctly. It is formed from EPDM and can be used in coolant, water, and air applications, with marine application approval noted by the manufacturer.

Compatible With 1986-1999 Ford Aerostar, 1994-1999 Chevrolet C1500, and 1994-1999 GMC C1500 applications where a molded heater hose is required.

Key Features

• Factory-molded shape for accurate routing in compact engine bays
• EPDM construction for heater hose and coolant service
• Small I.D. design with 16 mm (0.62 in) end 1 and 25 mm (1 in) end 2
• 43.3 in (1100 mm) centerline length for the listed routing path
• Approved for coolant, water, air, and marine applications
• Gates Molded Heater Hose line for OE-style replacement fitment

Detailed Description

Gates part number 19663 is a molded coolant and heater hose shaped to follow the factory routing used on select Ford, Chevrolet, and GMC trucks, SUVs, and vans. The molded profile helps maintain proper hose alignment in crowded engine compartments, while the EPDM material supports heater and cooling system service. This hose is listed for lower reservoir-to-tee routing on many Chevrolet C1500, K1500, Tahoe, GMC C1500, K1500, and Yukon applications, and for heater-to-water-pump routing on Ford Aerostar models.

This part cross-references Dayco 86079 for the same application.

What It Helps Address

• Cracked or leaking heater hose routing at the reservoir-to-tee connection
• Collapsed or softened hose sections in the cooling circuit
• Improper fit from universal hose bends in tight engine bays
• Coolant loss caused by aged molded hose material
• Routing issues on Chevrolet C1500, GMC K1500, and Ford Aerostar heater hose paths

Installation Notes and Tips

Verify end diameters, centerline length, and routing before installation. This Gates 19663 molded heater hose is listed for lower reservoir-to-tee and heater-to-water-pump positions, so confirm the vehicle’s hose path matches the catalog fitment. Inspect adjoining tees, clamps, and hard lines for wear before installing the new hose.

Quality Assurance

Gates manufactures this molded heater hose as an OEM-style replacement built to match the factory routing requirements of the listed applications. The EPDM construction and molded form support consistent fitment for the specified Chevrolet, GMC, and Ford vehicles.