Rein CHE0409 Engine Coolant Hose - Thermostat To Water Pump

OE Coolant Hose for BMW Cooling Systems

Rein CHE0409 is an OE-quality engine coolant hose for BMW cooling system service. It is built as a direct replacement for the original hose assembly, with the same branch shape and thermoplastic quick-connect fittings used on the factory part.

Compatible With BMW 128i, 328i, 328i xDrive, 323i, Z4, 528i, 528i xDrive, X3, X5, 328xi, 528xi, 525i, 525xi, 530i, 530xi, 325i, 325xi, 330i, and 330xi applications at the thermostat to water pump position.

Key Features

• Direct OE-style replacement for BMW thermostat to water pump coolant routing
• Thermoplastic quick-connect fittings help reduce installation time
• No cutting, refitting, or hose adjustment required
• Helps prevent leaks and repeat repairs from reused quick connectors and O-rings
• EPDM hose construction resists heat, salt, road debris, oil, and other contaminants
• Black hose finish with application-specific fitment

Detailed Description

Rein CHE0409 is engineered for European vehicle cooling systems where factory-style fit and connector design matter. The hose follows OE dimensions, including branch shape and connector style, to support a clean replacement on BMW models such as the 2006-2013 BMW 328i, 2007-2013 BMW 328i xDrive, and 2007-2010 BMW X5. The part number CHE0409 is also cross-referenced to Genuine 11537521049 for the same application.

Built from EPDM and measuring 12 inches centerline length, this Rein coolant hose is made for the thermostat to water pump connection and is designed to restore proper coolant flow without modifying the hose during installation. CHE0409 is a practical choice for BMW cooling system repair when the original hose assembly has aged, cracked, or developed connector wear.

Common Problems This Hose Can Address

• Coolant leaks at worn quick-connect fittings
• Cracked or brittle hose material from heat cycling
• Improper sealing caused by reused O-rings
• Fitment issues from non-OE hose shapes
• Repeat cooling system repairs after connector damage

Installation Notes and Tips

Verify the thermostat to water pump routing before installation and compare the original hose shape, connector style, and end diameters to CHE0409. Inspect mating surfaces, replace damaged seals as needed, and confirm the quick-connect fittings are fully seated before refilling the cooling system. This hose does not include installation hardware.

Quality Assurance

Rein focuses on OE-quality replacement cooling components for European vehicles, with hose assemblies built to match original dimensions and connector design. CHE0409 is manufactured to support factory-style service on BMW cooling systems and is identified by part number CHE0409 for accurate ordering and catalog lookup.