Dorman 902-5402CD Engine Coolant Reservoir Cap

Engine Coolant Reservoir Cap Replacement

Dorman 902-5402CD is a direct replacement engine coolant reservoir cap for restoring a sealed cooling system after the original cap is cracked, missing, or no longer holding pressure. This black plastic twist-on cap measures 76.2 mm in diameter and is rated for 15 psi, making it a practical OE-style service part for coolant tank maintenance.

For drivers searching for a coolant reservoir cap for Honda Civic or similar cooling system service parts, this Dorman cap provides a straightforward replacement built around the original fit and function. Part number 902-5402CD is also referenced by cross numbers 572.2010 and N5348001 for the same application.

Key Features

• Direct replacement engine coolant reservoir cap
• Twist-on attachment for secure installation
• Pressurized design rated at 15 psi
• Black plastic construction
• 76.2 mm diameter for proper tank fit
• No vent and no pressure release lever
• OE-style service part for cooling system repair

Detailed Description

This coolant tank cap is engineered to replace the original reservoir cap without changing the system’s intended sealing and pressure characteristics. The pressurized design helps maintain cooling system pressure, while the twist-on style supports a simple cap swap during routine cooling system service. Dorman 902-5402CD is a practical choice when the original cap is damaged, lost, or no longer sealing correctly. It is a direct replacement part for Honda Civic cooling system maintenance and other applications that use the same cap specification.

What It Helps Solve

• Coolant loss from a cap that no longer seals properly
• Pressure loss in the coolant reservoir
• Cracked or broken reservoir cap housing
• Missing coolant tank cap after service or repair
• Cooling system maintenance on vehicles using a 76.2 mm, 15 psi cap

Installation Notes and Tips

Verify the reservoir neck diameter, pressure rating, and twist-on style before installation. Inspect the sealing surface on the coolant tank for cracks, debris, or hardened residue, and make sure the cap seats fully before returning the vehicle to service. Confirm the replacement matches the original cap specification for your Honda Civic or other listed application before driving.

Quality Assurance

Dorman manufactures this cap as a direct replacement part built to match the original function and fit requirements of the cooling system. Part number 902-5402CD is intended for dependable service in applications that require a pressurized coolant reservoir cap with the specified diameter and pressure rating.