Rein CHR0003 Radiator Coolant Hose - Upper

OE-Style Upper Radiator Hose for BMW

Rein CHR0003 is an OE-quality radiator coolant hose built for European cooling systems that require an exact replacement. It is shaped to match the original hose assembly, including the thermoplastic quick-connect fittings, for a direct service fit on select BMW 528i, 525i, and 530i applications.

Compatible With 1999-2003 BMW 528i, 2001-2003 BMW 525i, and 2001-2003 BMW 530i in the upper radiator hose position, Rein CHR0003 supports a clean replacement without hose modification.

Key Features

• Direct replacement for OE radiator hose assemblies
• Application-specific design for the upper cooling circuit
• EPDM hose construction for heat and contamination resistance
• Thermoplastic quick-connect fittings match OE-style connections
• Black finish with a single-hose configuration
• Built to reduce installation time and avoid hose trimming or refitting
• Helps prevent leaks caused by reusing old quick connectors and O-rings

Detailed Description

Rein CHR0003 is engineered as an OE-quality radiator coolant hose for BMW cooling system service. The hose follows the original branch shape and connection style, making it a direct replacement for the factory upper radiator hose on the listed BMW 528i, 525i, and 530i models. Its EPDM construction is selected for resistance to heat, salt, road debris, oil, and other common underhood contaminants. The hose measures 17.72 inches centerline length and is designed for a maximum working pressure of 50 psi.

This part cross-references BMW 11531705223 for the same application. If you are replacing a worn BMW upper radiator hose, CHR0003 provides the OE-style fit needed for a straightforward cooling system repair.

What It Helps Fix

• Coolant leaks at the upper radiator hose connection
• Cracked, swollen, or heat-aged hose material
• Fitment issues from non-OE hose shapes
• Leaks caused by reusing old quick connectors or O-rings
• Extended repair time from cutting or adjusting the hose

Installation Notes and Tips

Install CHR0003 on the upper radiator hose location only for the listed BMW applications. Because the hose is application-specific, no cutting, refitting, or adjustment should be required when the correct vehicle is confirmed. Inspect the mating connections and sealing surfaces before installation, and replace worn connectors or seals as needed to avoid repeat leaks.

Quality Assurance

Rein designs this radiator hose as an OE-quality replacement for European vehicles, with dimensions and connector style matched to the original assembly. Part number CHR0003 is backed by a 24-month or 24,000-mile warranty.