Gates 51738 HVAC Heater Hose - Water Pump To Thermostat

BMW Heater Hose for Water Pump to Thermostat

Gates 51738 is a molded coolant hose built for BMW cooling system service where the hose runs from the water pump to the thermostat. Made from EPDM and formed to OEM-style dimensions, it supports a direct replacement for select BMW 128i, 328i, 528i, X3, X5, Z4, and related models.

Key Features

• EPDM construction for coolant-system durability
• Molded hose shape for the water pump to thermostat routing
• 1.5 in. / 38 mm inside diameter at both ends
• 12 in. / 305 mm centerline length
• No spring and no quick-connect fittings
• Direct replacement part number: Gates 51738

Product Details

This Gates Molded Coolant Hose line is engineered for upper, lower, bypass, heater, and other coolant applications using OEM-quality specifications. For this application, Gates 51738 serves as a molded heater hose/coolant hose replacement in BMW cooling systems, helping restore the factory-style routing between the water pump and thermostat. It cross-references Genuine 11537521049 for the same application.

Common Problems This Hose Can Address

• Coolant leaks at a cracked or aged hose section
• Softening, swelling, or collapse from heat and coolant exposure
• Improper hose routing after a failed replacement
• Cooling system service on BMW models with water pump to thermostat hose routing
• Loss of sealing at the hose ends due to wear

Installation Notes and Tips

• Verify the hose route and end diameters before installation.
• Inspect the water pump and thermostat connections for corrosion, residue, or damage.
• Replace coolant with the correct BMW-approved specification after service.
• Bleed the cooling system carefully to remove trapped air.
• Confirm fitment by year, model, and position before ordering.

Quality Assurance

Gates manufactures this molded coolant hose to OEM-quality specifications for the listed BMW applications. Fits 2006 BMW 325i, Water Pump To Thermostat; Fits 2006 BMW 325xi, Water Pump To Thermostat; Fits 2006 BMW 330i, Water Pump To Thermostat; Fits 2006 BMW 330xi, Water Pump To Thermostat; Fits 2006-2007 BMW 525i, Water Pump To Thermostat; Fits 2006-2007 BMW 525xi, Water Pump To Thermostat; Fits 2006-2007 BMW 530i, Water Pump To Thermostat; Fits 2006-2007 BMW 530xi, Water Pump To Thermostat; Fits 2006-2008 BMW Z4, Water Pump To Thermostat; Fits 2007-2010 BMW X3, Water Pump To Thermostat; Fits 2007-2010 BMW X5, Water Pump To Thermostat; Fits 2007-2013 BMW 328i, Water Pump To Thermostat; Fits 2007-2008 BMW 328xi, Water Pump To Thermostat; Fits 2008-2010 BMW 528i, Water Pump To Thermostat; Fits 2008 BMW 528xi, Water Pump To Thermostat; Fits 2008-2013 BMW 128i, Water Pump To Thermostat; Fits 2009-2010 BMW 528i xDrive, Water Pump To Thermostat; Fits 2009-2013 BMW 328i xDrive, Water Pump To Thermostat.