Dorman 603-5140 Heavy Duty Pressurized Engine Coolant Reservoir

The Dorman 603-5140 is a heavy duty pressurized engine coolant reservoir designed as a direct OE replacement for select IC Corporation and International commercial vehicles. This coolant overflow tank — also known as a degas bottle, antifreeze reservoir, or coolant recovery tank — restores proper cooling system pressurization and fluid level management to keep heavy duty engines running at optimal temperature.

Key Features:

• Direct OE Replacement: Engineered to match the fit and function of the original factory part for a seamless, hassle-free installation
• Heavy Duty Pressurized Design: Built to maintain cooling system pressure under the demanding conditions of commercial truck operation
• Durable Construction: Manufactured from quality materials engineered to withstand underhood heat, engine vibration, and thermal cycling
• Ideal Solution: Eliminates the need for costly OEM parts while delivering reliable, long-term performance
• Trusted Brand: Backed by Dorman's century-long legacy in the automotive and heavy duty aftermarket

Whether you're replacing a cracked, leaking, or failed coolant reservoir on a commercial bus or medium-duty truck, the Dorman 603-5140 provides a cost-effective, reliable solution that installs just like the original.