Rein CHR0023P Engine Coolant Hose - Expansion Tank (Lower) To Water Pump

OE Quality BMW Radiator Hose

Rein CHR0023P is an OE-quality engine coolant hose for European cooling systems, built as a direct replacement for the original radiator hose assembly. It is designed for BMW 540i, 740i, and 740iL applications with the expansion tank (lower) to water pump routing, including the quick-connect style used on these vehicles.

Key Features

• Direct-fit replacement for the OE hose layout
• Thermoplastic quick-connect fitting included for the specified application
• EPDM hose construction for heat and contamination resistance
• SAE J20 R4 D1 compliant hose design
• 50 psi maximum working pressure
• Black finish with application-specific dimensions
• Reduces installation time by avoiding hose modification

Detailed Product Overview

Rein CHR0023P is engineered to match the original hose shape, branch sizing, and connector style used on select BMW cooling systems. The hose measures 14.0 inches centerline length and uses 0.87-inch inside diameter ends, with one quick-connect fitting specified for the OE routing. For BMW 540i, BMW 740i, and BMW 740iL models, this radiator hose supports a clean replacement for the expansion tank (lower) to water pump connection without cutting, refitting, or adjusting the hose.

This part cross-references Genuine 11531711381 for the same application. Search terms such as BMW 540i lower radiator hose, BMW 740i coolant hose, and BMW 740iL expansion tank to water pump hose align with this application-specific replacement. Rein CHR0023P is a practical choice when replacing a worn or leaking OE-style coolant hose on 1999-2003 BMW cooling systems.

What This Hose Helps Address

• Coolant leaks at aged hose connections
• Cracked or hardened EPDM hose material
• Fitment issues caused by trimming or adapting universal hose
• Leaks from reusing old quick connectors or O-rings
• Cooling system service delays from incorrect hose shape or length

Installation Notes and Tips

Verify the vehicle build date and routing before installation, especially on 1999 BMW applications noted as from 9/98 with quick connectors. This hose is application-specific for the expansion tank (lower) to water pump position on the listed BMW models. Inspect mating surfaces, quick-connect seals, and adjacent cooling components before reassembly to help ensure a proper seal.

Quality Assurance

Rein designs this hose as an OE-quality replacement for European vehicles, with dimensions and connector style matched to the original assembly. It is made in Germany and backed by a 24-month/24,000-mile warranty.