Gates 18742 HVAC Heater Hose - Intake Manifold To Water Pump

Gates Molded Heater Hose for Tight Engine Bays

The Gates 18742 molded heater hose is a factory-shaped coolant hose built for compact engine compartments where a straight hose will not route correctly. It is made from EPDM and is suitable for coolant, water, and air service, with marine application approval noted by the manufacturer.

Use this molded heater hose for direct replacement service on select Buick, Oldsmobile, and Pontiac applications, including intake manifold to water pump routing. Gates 18742 is formed to match the original hose path for a cleaner, more accurate repair.

Key Features

• Factory-molded, OE-style hose shape
• EPDM construction for coolant system service
• Small inside diameter design for tighter engine compartments
• Suitable for coolant, water, and air applications
• Approved for marine applications
• Centerline length: 8.1 in. (206 mm)
• End inside diameters: 16 mm and 21 mm

Product Details

Gates Molded Heater Hose line products are built for applications that require a pre-formed hose rather than a universal straight section. This molded design helps maintain the original routing between the intake manifold and water pump, which is important in crowded engine bays where hose alignment and clearance matter. Part number 18742 is a direct-fit style replacement for select 1985-1986 Buick Skyhawk, 1985-1986 Oldsmobile Firenza, 1986 Pontiac Sunbird, and 1985 Pontiac J2000 Sunbird applications.

This part cross-references Dayco 87642 for the same application.

Common Repair Uses

• Replacing a cracked or leaking heater hose
• Restoring proper coolant flow between the intake manifold and water pump
• Correcting hose routing in a tight engine compartment
• Addressing soft, swollen, or heat-aged EPDM hose material
• Repairing a hose that no longer holds its molded shape

Installation Notes and Tips

Verify hose routing, end diameters, and centerline length before installation. Confirm the intake manifold to water pump path on the vehicle and inspect adjoining fittings, clamps, and connection points for wear or corrosion. Gates 18742 should be installed in the same molded orientation as the original hose to preserve clearance and routing.

Quality Assurance

Gates is known for OE-style hose construction and application-specific fitment. This molded heater hose is built to match the original routing requirements of the listed Buick, Oldsmobile, and Pontiac vehicles, supporting a precise replacement for the factory hose layout.