Dorman 603-882 Engine Coolant Reservoir

Engine Coolant Reservoir for Honda Civic

This Dorman engine coolant reservoir is a direct replacement for select Honda Civic models and is built to match the original fit and function. It is made from durable materials to handle underhood heat and engine vibration, and it includes a twist cap for a secure cooling system seal.

Compatible with 2016-2021 Honda Civic applications, this reservoir is a practical OE-style replacement for a cracked, leaking, or damaged coolant tank. Part number 603-882 is engineered for the same mounting and capacity requirements as the original component.

Key Features

• Direct replacement engine coolant reservoir for select Honda Civic models
• Constructed from durable plastic material for underhood use
• Natural finish with irregular shape to match original packaging layout
• Twist cap included with a 16 psi maximum pressure rating
• Pressurized design for cooling system operation
• Mounts using 2 holes; mounting brackets and hardware are not included
• Capacity: 1.1 L total capacity, 0.5 working capacity
• Level sensor not included

Detailed Description

Dorman 603-882 is engineered as a replacement coolant reservoir for 2016-2021 Honda Civic vehicles. It is manufactured to match the fit and function of the original part, helping restore proper coolant storage and system operation after the factory reservoir becomes damaged, brittle, or begins to leak. The reservoir uses a twist-style cap and a pressurized design rated to 16 psi, with a 1.1 liter capacity and a natural-color housing.

This part cross-references Honda (e.g., 191015BAA01) for the same application. If you are searching for a Honda Civic coolant reservoir replacement, Dorman 603-882 provides the correct form factor for the listed vehicle range.

What It Helps Fix

• Coolant leaks from a cracked or aging reservoir
• Low coolant storage caused by damaged tank walls
• Improper sealing at the reservoir cap
• Heat-related plastic deterioration in the cooling system
• Fitment issues after replacing a factory coolant tank

Installation Notes and Tips

Verify the reservoir shape, mounting hole count, and cap style before installation. Transfer any reusable hoses or fittings from the original setup as needed, and inspect the surrounding cooling system for cracks, hardened hoses, or contamination before refilling. Confirm the cooling system is properly bled after installation to help maintain stable operating temperature.

Quality Assurance

Dorman manufactures this replacement coolant reservoir from quality materials and engineers it to match original fit and function for the listed Honda Civic applications. Part number 603-882 is built for dependable underhood service in the cooling system.