Rein CHE0581 Engine Coolant Hose - Expansion Tank (Upper)

OE Coolant Hose for BMW Expansion Tank

Rein CHE0581 is an OE-quality engine coolant hose built for European cooling systems that require an exact replacement. It is designed for BMW 320i, 320i xDrive, 228i, 228i xDrive, 328i, 328i GT xDrive, 328i xDrive, 428i, 428i Gran Coupe, 428i xDrive, and 428i xDrive Gran Coupe applications with the expansion tank upper hose position.

• Direct replacement for the original BMW coolant hose assembly
• Reduces installation time with application-specific fitment
• No cutting, refitting, or adjusting the hose during installation
• Thermoplastic quick-connect fittings match OE-style connection points
• Resists heat, salt, road debris, oil, and other contaminants
• Built to SAE J20R4D1 standards
• Black rubber construction with a 174 psi maximum working pressure

Detailed Product Overview

This Rein engine coolant hose is engineered to match the original hose shape, branch sizing, and connector style used on the vehicle. The CHE0581 is a direct OE-style replacement for the upper expansion tank hose on select BMW 320i, 328i, and 428i models, helping restore proper coolant routing without modifying the hose or reusing worn quick connectors and O-rings. Rein CHE0581 is a practical choice for BMW cooling system service where exact fit and connector integrity matter.

This part cross-references BMW 17127596831 for the same application.

Common Cooling System Issues It Can Address

• Cracked or brittle coolant hose material
• Coolant seepage at quick-connect fittings
• Leaks caused by worn O-rings or reused connectors
• Improper hose fit after prior repairs or modifications
• Cooling system service on BMW expansion tank upper hose routing

Installation Notes and Tips

Verify the vehicle’s expansion tank upper hose routing before installation and compare the connector style to the original part. Because this hose is application-specific, it installs without cutting or reshaping when used on the listed BMW models. Inspect mating surfaces and surrounding cooling system components for wear, contamination, or damage before reassembly.

Quality Assurance

Rein Automotive OE-quality hoses are built as direct replacements for original equipment cooling hoses and assemblies. The CHE0581 follows OE-style dimensions and connector design for consistent fitment on the listed BMW applications.