Rein CHE0791 Engine Coolant Hose - Water Pipe To Oil Cooler

OE-Style Coolant Hose for Audi Cooling Service

Rein CHE0791 is an engine coolant hose built for European vehicle cooling systems that require an OE-style direct replacement. It matches the original hose shape and branch sizing, with thermoplastic quick connect fittings for a factory-style fit on select Audi applications.

Key Features

• Direct replacement engine coolant hose for the water pipe to oil cooler circuit
• OE-quality construction for select Audi A6 Quattro, S4, and Allroad Quattro applications
• Black coolant hose finish
• Hose end 1 outside diameter: 22.10 mm
• Hose end 2 outside diameter: 22.10 mm
• Hose end 1 inside diameter: 15.24 mm
• Hose end 2 inside diameter: 15.24 mm
• Rein part number CHE0791

Detailed Description

Rein CHE0791 is an OE-quality engine coolant hose engineered for the water pipe to oil cooler connection on select Audi models. It is shaped to match the original hose assembly, including branch geometry and quick connect-style fitment details, which helps maintain the factory routing used in the cooling system. This makes CHE0791 a practical replacement for Audi A6 Quattro, Audi S4, and Audi Allroad Quattro vehicles that require the specified hose dimensions and connection points.

This part cross-references Audi 078121058AM for the same application. Rein CHE0791 is a direct-fit cooling system service part for 2000-2005 Audi A6 Quattro, 2000-2002 Audi S4, and 2001-2005 Audi Allroad Quattro applications listed below.

Common Issues This Hose Can Address

• Coolant leakage at the water pipe to oil cooler hose connection
• Cracked or aged rubber hose material
• Improper fit from a non-OE-shaped replacement hose
• Damaged quick connect fitting interfaces
• Cooling system service needs on high-mileage Audi vehicles

Installation Notes and Tips

• Verify the vehicle year and VIN break before ordering, especially for 2000 Audi A6 Quattro and 2000 Audi S4 applications.
• Inspect mating pipes, seals, and retaining points before installation.
• Confirm hose routing matches the original layout before securing the assembly.
• Use the listed inside and outside diameters to compare against the removed hose.

Quality Assurance

Rein Automotive focuses on OE-quality replacement hoses for European vehicles, with dimensions and connection details patterned after the original equipment design. CHE0791 is built to match the factory-style application requirements for the specified Audi cooling system service.

Compatible With

• Fits 2001-2005 Audi Allroad Quattro, Water Pipe To Oil Cooler
• Fits 2001-2004 Audi A6 Quattro, Water Pipe To Oil Cooler
• Fits 2001-2002 Audi S4, Water Pipe To Oil Cooler
• Fits 2000 Audi A6 Quattro, Water Pipe To Oil Cooler, From VIN 4BY020000
• Fits 2000 Audi S4, Water Pipe To Oil Cooler, From VIN 8DY033556