Gates 51622 HVAC Heater Hose - Auxiliary Water Pump Inlet

Gates 51622 Molded Coolant Hose Overview

The Gates 51622 molded coolant hose is built for the auxiliary water pump inlet on select BMW applications. It follows application-specific dimensions and uses integrated OE-style components to match the original hose layout more closely than a universal replacement.

Gates Molded Coolant Hose products are engineered for specific vehicle applications and can include molded branches, quick-connectors, sensors, and restrictors where the original design requires them. This helps maintain the correct routing and connection style for BMW cooling system service.

• Application-specific molded coolant hose for the auxiliary water pump inlet
• EPDM, plastic, and steel construction
• Female quick connector integrated into the hose assembly
• End 1 inside diameter: 19 mm (.75 in.)
• End 2 inside diameter: 22 mm (.85 in.)
• Centerline length: 324 mm (12.75 in.)
• Modular hose design for OE-style routing

Fitment and Application Details

Compatible with 2006 BMW 325i, auxiliary water pump inlet; 2006 BMW 325xi, auxiliary water pump inlet; 2006 BMW 330i, auxiliary water pump inlet; 2006 BMW 330xi, auxiliary water pump inlet; and 2009-2010 BMW 335d, auxiliary water pump inlet. The Gates 51622 is a direct-fit molded coolant hose for these BMW cooling system applications.

This part cross-references Rein CHH0477 for the same application.

What This Hose Helps Address

• Coolant leakage at a cracked or aged molded hose
• Improper fit from a previous universal hose repair
• Damaged or worn quick-connector connection points
• Cooling system service needs at the auxiliary water pump inlet
• Routing issues caused by a hose that no longer matches the OE shape

Installation Notes and Tips

Verify hose routing, connector orientation, and end diameters before installation. Inspect the mating plastic and metal connections for wear, corrosion, or residue that could affect sealing. Confirm the hose is seated fully at the auxiliary water pump inlet and that the cooling system is refilled and bled according to BMW service procedures.

Quality Assurance

Gates is a recognized aftermarket supplier of modular coolant hose assemblies, with products built to application-specific dimensions and OE-style component layouts for select vehicles.