Rein CHE0504 Engine Coolant Hose - Expansion Tank (Upper) To Cylinder Heads

OE Coolant Hose for BMW 545i and 645Ci

Rein CHE0504 is an OE-quality engine coolant hose built for European cooling systems that use factory-style branched routing and thermoplastic quick-connect fittings. It is a direct-fit replacement for the upper expansion tank to cylinder heads hose on select 2004 BMW 545i and 645Ci applications.

• Direct replacement for OE hose assemblies
• Branched hose design with 1 quick-connect fitting
• EPDM hose material for cooling-system service
• Resistant to heat, salt, road debris, oil, and other contaminants
• Reduces installation time by eliminating hose cutting and refitting
• Black finish with application-specific dimensions

Detailed Product Overview

Rein CHE0504 is engineered to match the original hose layout, including branch shape and connector style, for a factory-style repair on European vehicles. The hose measures 29 inches centerline length and uses a branched configuration with one quick connect fitting, helping maintain the original routing from the expansion tank (upper) to the cylinder heads. For BMW 545i and BMW 645Ci cooling system service, this part number CHE0504 supports a clean OE replacement without modifying the hose or reusing worn connectors.

This part cross-references BMW 17127519254 for the same application.

Vehicle Fitment

• Fits 2004 BMW 545i, expansion tank (upper) to cylinder heads, to 7/04, with quick connectors.
• Fits 2004 BMW 645Ci, expansion tank (upper) to cylinder heads, to 7/04, with quick connectors.

What This Hose Helps Address

• Coolant leaks at aging hose connections
• Cracked or hardened original EPDM hose material
• Fitment issues from reused quick connectors and O-rings
• Extended installation time caused by trimming or refitting
• Cooling-system service on BMW 545i and 645Ci models with factory quick-connect routing

Installation Notes and Tips

Verify the vehicle build date before ordering, since this hose applies to 2004 BMW 545i and 645Ci models built to 7/04. Confirm the hose routing, connector style, and branch layout against the original part before installation. Replace worn sealing components as part of a proper cooling-system repair, and inspect adjacent hoses and fittings for age-related wear.

Quality Assurance

Rein positions this hose as an OE-quality replacement for European vehicles, with dimensions and connector design matched to the original assembly. CHE0504 is built for direct-fit service where factory routing and quick-connect compatibility matter.