Gates 51618 HVAC Heater Hose - Heater Outlet

BMW X3 Heater Outlet Hose

The Gates 51618 molded coolant hose is built for the heater outlet connection on select 2004-2007 BMW X3 models. It follows application-specific OE-style routing and integrates the quick-connect features needed for a direct replacement on the cooling system side.

Key Features

• Fits 2004-2007 BMW X3, heater outlet
• Molded coolant hose construction for application-specific routing
• Made from EPDM, plastic, and steel for cooling-system service
• Includes two female quick connectors
• Centerline length: 35 in. (889 mm)
• End inside diameters: 0.7 in. (18 mm) and 0.8 in. (20 mm)
• Gates part number 51618

Product Details

Gates Molded Coolant Hose line parts are built for specific vehicle applications and follow OE-style layouts that incorporate the required integrated components. For this BMW X3 heater outlet hose, that means a molded design with quick-connect fittings that match the original routing and connection style used in the cooling and HVAC system. The Gates 51618 is a direct-fit replacement for 2004, 2005, 2006, and 2007 BMW X3 models at the heater outlet position.

This part cross-references Rein CHH0515 for the same application.

Common Replacement Reasons

• Cracked or brittle heater hose material
• Coolant seepage at the hose or connector ends
• Damaged quick-connect fittings
• Restricted heater circuit flow from an aging hose assembly
• Incorrect hose routing after prior repair work

Installation Notes

Verify the heater outlet routing and connector style against the original hose before installation. Inspect the mating quick-connect points, seals, and adjacent plastic fittings for wear or residue, and confirm the hose follows the factory path without twist or tension. This hose is specified for the heater outlet position on the BMW X3, so match the vehicle year and connection layout carefully.

Quality Assurance

Gates is a recognized aftermarket supplier of modular coolant hose assemblies, with products engineered to mirror OE-style application requirements and integrated connection features.