Dorman 603-5510 Engine Coolant Reservoir - Front

Engine Coolant Reservoir Overview

This Dorman engine coolant reservoir is a direct-fit replacement built to match the original part’s fit and function. It is made from plastic and engineered to handle underhood heat and engine vibration in service.

Compatible with Volvo WG and Volvo WI applications, this reservoir is identified by part number 603-5510. It includes a spring-loaded twist cap design and a pressurized construction rated to 20 PSI.

Key Features

• Direct replacement coolant reservoir for original-equipment fit and function.
• Plastic construction for underhood use.
• Pressurized design with a 20 PSI cap rating.
• Includes a cap with twist-on, spring-loaded operation.
• Mounting brackets and mounting holes are part of the reservoir design.

Detailed Description

Dorman 603-5510 is engineered as a replacement engine coolant reservoir for select Volvo medium-duty applications. It is manufactured to match the original part’s fit and function, helping maintain proper coolant storage and system operation. The white plastic housing is built for the heat and vibration common in engine compartments, while the pressurized design and included cap support normal cooling-system operation.

This part fits 1996-2000 Volvo WG, front, ID No. 3966106, and 1996-1998 Volvo WI, front, ID No. 3966106. For buyers searching for a Volvo WG coolant reservoir or Volvo WI coolant reservoir, part number 603-5510 provides a direct replacement reference for the listed applications. This part cross-references Monroe Shocks & Struts (e.g., 575.1084, 212013201) for the same application.

What It Is Used For

• Replacing a cracked or leaking coolant reservoir.
• Restoring coolant storage capacity in the cooling system.
• Addressing cap sealing or pressure-retention issues.
• Replacing a damaged reservoir with broken mounting points or brackets.

Installation Notes and Tips

Verify the ID number 3966106 before ordering. Confirm the reservoir mounting layout, cap style, and pressure rating match the original component. Inspect the cooling system for leaks, hose wear, and cap condition during installation.

Quality Assurance

Dorman manufactures this replacement reservoir from quality materials and builds it to match the original part’s fit and function. Part number 603-5510 is intended for the listed Volvo applications.