Rein CHE0870 Engine Coolant Hose - Expansion Tank (Upper) To Radiator

OE-Style Coolant Hose for BMW Cooling Systems

Rein CHE0870 is an engine coolant hose built for European cooling-system service, with OE-quality construction and direct-replacement dimensions. It is shaped to match the original hose routing for BMW applications, including the expansion tank (upper) to radiator connection.

• Direct replacement coolant hose for BMW cooling system service
• Black hose finish with OE-style branch sizing and formed shape
• Hose end 1 outside diameter: 14.05 mm; inside diameter: 7.75 mm
• Hose end 2 outside diameter: 12.50 mm; inside diameter: 7.14 mm
• Built to match the original hose and hose assembly layout
• Rein CHE0870 cross-references BMW 17111427156 for the same application

Fitment Details

Compatible With BMW cooling-system applications in the expansion tank (upper) to radiator position. Fits 2001-2003 BMW 525i, Expansion Tank (Upper) To Radiator; Fits 2001-2003 BMW 530i, Expansion Tank (Upper) To Radiator; Fits 1997-2003 BMW 540i, Expansion Tank (Upper) To Radiator; Fits 2003 BMW Z8, Expansion Tank (Upper) To Radiator; Fits 1997-2001 BMW 740i, Expansion Tank (Upper) To Radiator; Fits 1996-2001 BMW 740iL, Expansion Tank (Upper) To Radiator; Fits 1997-2000 BMW 528i, Expansion Tank (Upper) To Radiator.

What This Hose Helps Address

• Cracked or brittle upper coolant hose material
• Coolant seepage at the expansion tank-to-radiator connection
• Softening, swelling, or collapse in an aging hose
• Incorrect fit from a non-OE-shaped replacement hose
• Cooling-system service on BMW 525i, 530i, 540i, 740i, 740iL, 528i, and Z8 models

Installation Notes and Tips

Confirm the hose routing and end diameters before installation, especially on BMW 525i, 530i, and 540i cooling systems. Inspect adjoining plastic fittings, clamps, and radiator necks for wear before reassembly, and replace any damaged mating parts to maintain a secure seal. Verify the hose is seated fully at both ends and check for leaks after the engine reaches operating temperature.

Quality Assurance

Rein Automotive supplies OE-quality replacement hoses for European vehicles, with dimensions and connector details matched to the original design. CHE0870 is engineered as a direct-fit replacement for the listed BMW applications.