Rein CHE0231 Engine Coolant Hose - Adapter To Pipe or Oil Cooler (Upper) To Pipe

OE Coolant Hose for Audi and Volkswagen

Rein CHE0231 is an OE-quality engine coolant hose built for European cooling system applications that require the original hose shape, branch layout, and quick-connect fit. It is a direct replacement for the factory hose assembly on select Audi and Volkswagen models, including Audi A4, A6, S4, Allroad Quattro, and Volkswagen Passat applications.

Key Features

• OE-style replacement coolant hose for European vehicles
• Black hose construction for a factory-style appearance
• Hose end outside diameters: 22.40 mm and 23.39 mm
• Hose end inside diameters: 16.28 mm and 15.21 mm
• Direct replacement for applications using OE part number 078121096AD
• Rein CHE0231 coolant hose for upper oil cooler and adapter-to-pipe connections

Detailed Description

Rein CHE0231 is engineered as an OE-quality engine coolant hose for Audi and Volkswagen cooling system service. The hose follows the original manufacturer’s dimensions and connection style, including the thermoplastic quick-connect fittings and branch geometry used on the factory assembly. That makes it a direct replacement for the original hose on 1999-2005 Audi A4, A4 Quattro, A6, A6 Quattro, S4, and Allroad Quattro, plus 2000-2005 Volkswagen Passat applications. For buyers searching for a Rein CHE0231 coolant hose or an OE replacement hose for Audi A6 Quattro cooling system repair, this part matches the intended factory configuration.

This part cross-references OE number 078121096AD for the same application.

What It Helps Repair

• Coolant leaks at cracked or aged hose sections
• Loose or damaged quick-connect hose ends
• Cooling system service on upper oil cooler connections
• Fitment issues caused by incorrect hose shape or diameter
• Replacement of brittle factory coolant hose assemblies

Installation Notes and Tips

Verify the hose routing, end diameters, and connection style before installation. This hose is listed for adapter-to-pipe and upper oil cooler-to-pipe positions, so confirm the vehicle’s original layout matches the application. Inspect adjoining pipes, seals, and clamps during service, and replace any worn components before refilling the cooling system. After installation, bleed the cooling system according to the vehicle manufacturer’s procedure.

Quality Assurance

Rein Automotive supplies OE-quality cooling components for European vehicles, with replacement parts built to match original fit and connection design. CHE0231 is made to the same general size and shape requirements as the factory hose assembly for the listed Audi and Volkswagen applications.