SKP SK603703 Engine Coolant Reservoir

Engine Coolant Reservoir Overview

This SKP engine coolant reservoir is a direct-fit replacement for select Audi and Volkswagen applications. It is built for vehicles that need a replacement expansion tank with the correct fitment and connection points for the cooling system.

Key Features

• Direct-fit replacement for select European cooling system applications
• Engine coolant reservoir for maintaining proper coolant expansion and recovery
• Fits Audi A4, A6, S4, RS6, and Allroad Quattro applications listed below
• Fits Volkswagen Passat applications listed below
• SKP part number SK603703 for easy identification

Detailed Fitment

Compatible With 1998-2005 Audi A4, 1998-2005 Audi A4 Quattro, 1998-2005 Audi A6, 1998-2005 Audi A6 Quattro, 2000-2002 Audi S4, 2003-2004 Audi RS6, 2003-2005 Audi Allroad Quattro, and 1998-2005 Volkswagen Passat. For 1998 Audi A4 and A4 Quattro, fitment applies from VIN 8D-W-007 800. For 1998 Audi A6 and A6 Quattro, fitment applies from VIN 4B-W-000 001.

This part cross-references Dorman - OE Solutions (e.g., 603-703) for the same application. SK603703 is a practical replacement choice when the original reservoir is cracked, leaking, or no longer holding coolant properly.

What It Is Used For

• Replacing a cracked or damaged coolant reservoir
• Restoring coolant expansion and recovery function
• Addressing coolant loss from reservoir leaks
• Correcting fitment issues with an aging expansion tank

Installation Notes and Tips

Verify the vehicle year, model, and VIN break before ordering, especially for 1998 Audi A4, A4 Quattro, A6, and A6 Quattro applications. Compare the original reservoir to the replacement part before installation to confirm hose routing and mounting details. SK603703 should be matched to the cooling system configuration listed in the fitment data.

Quality Assurance

SKP replacement cooling components are built as application-specific parts for the listed Audi and Volkswagen fitments. Part number SK603703 is identified for straightforward catalog matching and service replacement.