Gates 19633 HVAC Heater Hose - Heater To Pipe-2

Gates Molded Heater Hose 19633 Overview

The Gates 19633 molded heater hose is an OEM-style coolant hose built for tight engine compartments where a straight hose will not route correctly. With a 19 mm (0.75 in) inside diameter at both ends and a 345 mm (13.6 in) centerline length, it supports heater circuit routing in select Buick, Oldsmobile, and Pontiac applications.

Gates Molded Heater Hose line products are factory-molded to match the shape needed for modern underhood layouts. This hose is made from EPDM and is approved for coolant, water, air, and marine applications.

Key Features

• Part number 19633
• OEM-style molded heater hose for heater circuit routing
• EPDM construction for coolant, water, and air service
• 19 mm (0.75 in) inside diameter on both ends
• 345 mm (13.6 in) centerline length
• Molded shape for tighter engine compartment routing
• Approved for marine applications

Product Details

This Gates molded coolant hose is built for heater-to-pipe routing where a formed hose is required. The molded profile helps maintain the correct path in compact engine bays, and the EPDM material is suited for heat and fluid exposure in HVAC and cooling-system service. The 19633 is a direct-fit style hose for select 1988-1991 Buick LeSabre, Oldsmobile Delta 88, Oldsmobile 98, and Pontiac Bonneville applications. This part cross-references Dayco 88377 for the same application.

Common Issues This Hose Can Address

• Cracked or leaking heater hose at the molded section
• Incorrect routing from a previous straight-hose repair
• Coolant seepage at the heater-to-pipe connection
• Heat-related hose hardening or deterioration
• Poor fitment in tight engine compartments

Installation Notes and Tips

Verify the hose path, end diameters, and centerline length before installation. Confirm the heater-to-pipe routing on the vehicle and inspect adjoining pipes, clamps, and sealing surfaces for wear or corrosion. For best results, replace the hose only after the cooling system has cooled completely and refill/bleed the system according to the vehicle service procedure.

Quality Assurance

Gates manufactures molded heater hoses to OE-style dimensions and routing requirements for service replacement use. Part number 19633 is built to match the shape needed for select Buick LeSabre, Oldsmobile Delta 88, Oldsmobile 98, and Pontiac Bonneville heater hose applications.

Vehicle Fitment

• Fits 1989-1991 Buick LeSabre, Heater To Pipe-2
• Fits 1989-1991 Oldsmobile Delta 88, Heater To Pipe-2
• Fits 1989-1990 Oldsmobile 98, Heater To Pipe-2
• Fits 1988-1990 Pontiac Bonneville, Heater To Pipe-2