Gates 51657 HVAC Heater Hose - Reservoir (Upper) or Reservoir To Engine

Gates 51657 Molded Coolant Hose Overview

The Gates 51657 molded coolant hose is a molded EPDM and plastic heater hose built for specific OE-style applications. It follows the shape and routing needed for the cooling system on select Chevrolet models, including Malibu, Malibu Limited, and Impala applications.

As part of the Gates Molded Coolant Hose line, this hose is engineered for application-specific fitment and can include integrated modular features found in original equipment designs. For buyers searching for a 2014-2015 Chevrolet Malibu reservoir to engine heater hose or a 2015 Chevrolet Impala reservoir to engine coolant hose, this part number is a direct match for the listed vehicles.

Key Features

• Gates part number 51657
• Molded coolant hose / HVAC heater hose application
• EPDM and plastic construction
• Centerline length: 39.12 in. (994 mm)
• End 1 inside diameter: 0.29 in. (7 mm)
• End 2 inside diameter: 0.35 in. (9 mm)
• One branch configuration with molded construction
• No spring and no quick-connect fittings

Product Details

The Gates Molded Coolant Hose product line is built around application-specific routing and OE-style geometry for modular coolant and heater hose systems. This Gates 51657 hose is molded to match the listed vehicle layouts and uses a branch-style modular design to follow the factory coolant path. It is a practical replacement for owners looking for a 2014-2015 Chevrolet Malibu reservoir to engine hose, a 2015 Chevrolet Impala reservoir to engine hose, or a 2016 Chevrolet Malibu Limited reservoir (upper) hose.

This part cross-references 27451X and 23497921 for the same application.

Common Problems This Hose Can Address

• Cracked or brittle heater hose material
• Coolant seepage at a molded hose section
• Incorrect hose routing after replacement
• Heat-related hose deformation
• Loss of factory-style fit at the reservoir-to-engine path

Installation Notes and Tips

Verify the vehicle year, model, and hose position before installation. This Gates 51657 hose is listed for 2014-2015 Chevrolet Malibu, reservoir to engine; 2015 Chevrolet Impala, reservoir to engine; and 2016 Chevrolet Malibu Limited, reservoir (upper). Inspect mating connections, clamps, and adjacent cooling system components for wear before installing the new hose.

Because this is a molded hose with specific routing, compare the original hose shape and branch orientation to the replacement part before final assembly. Confirm the end diameters and centerline length match the application requirements.

Quality Assurance

Gates is a recognized aftermarket supplier of modular coolant hose assemblies and OE-style replacement hose components. The 51657 is manufactured for specific applications to match the factory-style layout used on the listed Chevrolet vehicles.