Dorman 603-372 Engine Coolant Reservoir - Front

Engine Coolant Reservoir for Saab 9-3 and 9-3X

Dorman 603-372 is a replacement engine coolant reservoir built from plastic to handle underhood heat and engine vibration. It is engineered to match the original fit and function for Saab cooling system service, with a pressurized design and included spring-loaded twist cap rated to 20 psi.

Key Features

• Replacement engine coolant reservoir for front-mounted applications
• Plastic construction with a white finish
• Pressurized reservoir design with cap included
• Spring-loaded twist cap with 20 psi maximum pressure rating
• Engineered to match OE fit and function
• Fits 2003-2011 Saab 9-3, front
• Fits 2010-2011 Saab 9-3X, front

Detailed Description

This Dorman coolant reservoir, part number 603-372, is made for Saab cooling system repair where the original tank has cracked, warped, or lost pressure retention. The reservoir is designed for front-position installation on the 2003-2011 Saab 9-3 and 2010-2011 Saab 9-3X, and it follows the original part’s fit and function for straightforward replacement. This part cross-references SKP SK603372 for the same application.

What It Helps Fix

• Coolant leaks from a cracked or aged reservoir
• Loss of coolant level stability in the expansion tank
• Pressure loss at the reservoir cap or sealing surfaces
• Overheating concerns caused by low coolant volume
• Visible plastic deterioration from heat cycling and vibration

Installation Notes and Tips

Verify the vehicle’s front-mounted reservoir location before installation. Transfer or connect the cooling system components as required by the vehicle configuration, and inspect the cap sealing surface, hoses, and nearby fittings for wear before refilling. After installation, bleed the cooling system according to Saab service procedures to help restore proper pressure and coolant circulation.

Quality Assurance

Dorman manufactures this reservoir from materials selected to withstand engine-bay heat and vibration, with OE-style fit and function in mind. The included cap is spring-loaded and pressure rated to 20 psi for use in the specified pressurized cooling system.