Rein CHE0138R Engine Coolant Hose - Expansion Tank (Lower) To Water Pump

OE Quality Coolant Hose for BMW Cooling Systems

Rein CHE0138R is an OE-quality engine coolant hose built for European cooling system service. It is a direct replacement for the original hose assembly on select BMW 5 Series and 6 Series models, with application-specific shaping and thermoplastic quick connect fittings that match the factory design.

For BMW 545i, 550i, 645Ci, and 650i applications, this hose is made to simplify replacement at the expansion tank lower connection to the water pump. Rein CHE0138R helps restore proper coolant routing without cutting, refitting, or adjusting the hose.

Key Features

• Application-specific OE replacement for European vehicles
• Direct-fit design reduces installation time
• No cutting, refitting, or hose adjustment required
• Thermoplastic quick connect fittings match factory-style connections
• EPDM hose construction resists heat, salt, road debris, oil, and other contaminants
• Built to SAE J20R4 -D1 standards
• Compatible with BMW cooling system service where OE-style fitment is required

Detailed Product Overview

This Rein engine coolant hose is engineered as a direct OE-style replacement for the factory hose assembly. The molded shape, branch geometry, and quick connect ends are designed to follow the original BMW layout, helping maintain proper coolant flow and a secure connection at the expansion tank lower to water pump route. The CHE0138R part number is a practical choice for technicians and DIY repairs that call for a precise replacement hose on BMW 545i, 550i, 645Ci, and 650i models.

Rein CHE0138R cross-references BMW OE part numbers 17127519252 and 17127545653 for the same application.

What This Hose Helps Address

• Coolant leaks at worn hose connections
• Cracked or heat-aged original hose material
• Fitment issues caused by reused quick connectors or O-rings
• Cooling system service delays from trimming or adapting a universal hose
• Repeat repairs caused by mismatched replacement parts

Installation Notes and Tips

Compatible With 2004-2005 BMW 545i, expansion tank (lower) to water pump. Compatible With 2004-2005 BMW 645Ci, expansion tank (lower) to water pump. Compatible With 2006-2010 BMW 550i, expansion tank (lower) to water pump. Compatible With 2006-2010 BMW 650i, expansion tank (lower) to water pump.

Inspect the mating cooling system connections before installation and verify the routing matches the original hose path. This hose uses OE-style quick connect fittings, so proper seating at the connection points is important for leak-free operation. Confirm the vehicle application by model year and position before service.

Quality Assurance

Rein Automotive supplies OE-quality replacement hoses for European vehicles, with construction and fitment details modeled after the original manufacturer design. CHE0138R is built for direct replacement service and manufactured to meet SAE J20R4 -D1 requirements.