Dorman 603-844 Engine Coolant Reservoir

Engine Coolant Reservoir for Transit Vans

This Dorman engine coolant reservoir is a direct replacement for select Ford Transit vans. Built from clear plastic with a pressurized twist cap, it matches the original fit and function for 2015-2019 Ford Transit, Transit-150, Transit-250, Transit-350, and Transit-350 HD applications.

Part number 603-844 is engineered for the demands of underhood heat and engine vibration, making it a practical OE-style replacement for cooling system service on Ford Transit models.

Key Features

• Direct replacement engine coolant reservoir for select Ford Transit vans
• Clear plastic construction for easy visual coolant level checks
• Pressurized design with included twist cap rated to 21 psi
• Mounting brackets included for proper installation support
• 6.3 qt. capacity for the specified application
• Matches original fit and function for OE-style service

Detailed Description

Dorman 603-844 is a replacement coolant reservoir manufactured to match the original part’s fit and function on 2015-2019 Ford Transit, Transit-150, Transit-250, Transit-350, and Transit-350 HD vehicles. The circular reservoir is made from durable plastic and is designed to handle heat cycling and engine vibration in the cooling system. Its clear body helps with routine coolant inspection, while the included pressurized twist cap supports the specified system pressure rating.

This part cross-references Ford BK2Z8A080B for the same application. If you are searching for a 2015-2019 Ford Transit coolant reservoir, Ford Transit-250 coolant reservoir replacement, or a Dorman 603-844 coolant tank for Transit vans, this part is built for that exact vehicle group.

What It Helps Fix

• Cracked or leaking coolant reservoir housing
• Loss of coolant from a damaged expansion tank
• Broken or worn reservoir cap sealing issues
• Coolant level visibility problems caused by an opaque or damaged tank
• Cooling system service needs on high-mileage Ford Transit vans

Installation Notes and Tips

Verify the reservoir shape, mounting hole count, cap style, and pressure rating before installation. Inspect hoses, clamps, and surrounding cooling system components for wear or contamination during replacement. Confirm the reservoir is properly seated in the mounting brackets and that the cap is tightened to the correct position after filling and bleeding the cooling system.

Quality Assurance

Dorman manufactures this reservoir from materials selected to withstand underhood heat and vibration, with engineering focused on matching OE fit and function. Part number 603-844 is built as a replacement for the original Ford application listed above.