Gates 19623 HVAC Heater Hose

Gates 19623 Molded Heater Hose Overview

The Gates 19623 molded heater hose is an OEM-style coolant hose built for tight engine compartments where a formed routing path matters. With a 19 mm (0.75 in) inside diameter at both ends and a 17.5 in (445 mm) centerline length, it supports heater, coolant, water, and air routing in select applications.

Gates Molded Heater Hose products are shaped to follow factory-style bends, helping maintain proper hose routing in compact bays such as Chevrolet Silverado 1500, GMC Sierra 1500, Ford Escort, and Mercury Lynx applications. The Gates 19623 is also approved for marine use.

Key Features

• OEM-style molded heater hose for factory routing
• EPDM construction for coolant and heater service
• 0.75 in (19 mm) inside diameter at both ends
• 17.5 in (445 mm) centerline length
• Suitable for coolant, water, and air applications
• Approved for marine applications
• Direct-fit style for select HVAC hose positions

Detailed Product Description

This Gates 19623 molded coolant hose is formed to match the routing needs of smaller, tighter-fitting engine compartments. The EPDM material is used in cooling-system service, and the molded shape helps the hose follow the intended path without relying on a straight universal hose. For buyers searching for a molded heater hose for 2004-2006 Chevrolet Silverado 1500 or 2005-2006 GMC Sierra 1500, this part number is listed for auxiliary water pump to pipe applications as well as several heater-to-pipe and heater-to-engine positions on select Ford and Mercury vehicles.

This part cross-references Four Seasons 63173 for the same application.

What It Helps Address

• Cracked or leaking heater hose sections
• Improper hose routing in compact engine bays
• Coolant loss at molded hose connections
• Service replacement for worn OEM-style heater hose runs
• Routing needs for heater, coolant, water, or air lines

Installation Notes and Fitment

Verify hose routing, end size, and centerline length before installation. This hose is listed for select positions including Auxiliary Water Pump-2 To Pipe-4, Heater To Tee-2, Tee-2 To Heater, Heater To Pipe-1, Heater To Pipe, Heater To Pipe-2, and Heater To Engine. Compatible fitment includes 2004-2006 Chevrolet Silverado 1500, 2005-2006 GMC Sierra 1500, and 2007 Chevrolet Silverado 1500 Classic / 2007 GMC Sierra 1500 Classic in Auxiliary Water Pump-2 To Pipe-4 applications, plus select 1983-1992 Cadillac, Ford, and Mercury heater hose routes. Confirm vehicle configuration notes such as A/C and heavy-duty heater equipment before ordering.

Quality Assurance

Gates is known for OE-style hose construction and factory-molded fitment profiles. The 19623 molded heater hose is built to match the dimensional and routing requirements listed for its applications, supporting a direct replacement approach for select cooling-system service.