Dorman 603586 Non-Pressurized Coolant Reservoir with Cap

The Dorman 603-586 is a non-pressurized coolant recovery reservoir designed as a direct replacement for worn or damaged original equipment on select Chrysler and Dodge vehicles. This overflow tank collects coolant as it expands during engine heating cycles and returns it to the cooling system as the engine cools, helping maintain proper coolant levels and preventing air pockets in the system.

Key Features:

• Non-pressurized design for overflow/recovery applications
• Includes vented cap for proper system operation
• Manufactured from durable plastic materials engineered to withstand underhood heat and engine vibration
• Direct replacement design matches the fit and function of the original part for seamless installation
• Replaces OEM part numbers 5058371AC, 5058371AD, and 5058371AE
• Backed by over 100 years of Dorman automotive aftermarket experience

This replacement coolant reservoir is engineered to restore proper cooling system function and provide reliable, long-lasting performance. The non-pressurized design makes it suitable for recovery tank applications where coolant overflow is collected and returned to the radiator or pressurized reservoir.