Dorman 902-5402 Engine Coolant Reservoir Cap

Engine Coolant Reservoir Cap Replacement

Dorman 902-5402 is a direct replacement engine coolant reservoir cap for vehicles that need a sealed, pressurized coolant tank closure. It is built from black plastic with a 76.2 mm diameter and a twist-on attachment style for a straightforward OE-style replacement.

For drivers searching for an engine coolant reservoir cap for Honda Civic or Toyota Corolla applications, this cap is engineered to restore proper tank sealing after the original cap is cracked, missing, or no longer holding pressure. The Dorman 902-5402 also cross-references Monroe Shocks & Struts 572.2010 and N5348001 for the same application.

Key Features

• Direct replacement coolant tank cap for pressurized reservoir systems
• Black plastic construction
• Twist-on attachment type for secure installation
• 76.2 mm diameter
• 15 psi maximum pressure rating
• No vent and no pressure release lever
• Designed as a replacement for Dorman 902-5402 applications

Detailed Product Overview

This engine coolant reservoir cap is built to match the basic form and function of the original cap so the cooling system can maintain the correct sealed condition. The pressurized design helps the reservoir retain system pressure, while the twist-on fit supports a clean replacement on the tank opening. If you are replacing a damaged coolant reservoir cap on a Honda Civic or Toyota Corolla, Dorman 902-5402 provides a direct-fit service part for that repair path.

Common Problems It Can Address

• Cracked coolant reservoir cap
• Lost or missing reservoir cap
• Coolant seepage around the tank opening
• Loss of cooling system pressure at the reservoir
• Cap that no longer seals properly

Installation Notes and Tips

Confirm the reservoir opening diameter and pressure rating before installation. Inspect the tank neck and sealing surface for damage, then install the cap by aligning it and turning it into place until fully seated. After installation, check for proper fit and verify that the cooling system maintains a secure seal during normal operation.

Quality Assurance

Dorman designs replacement parts to match original equipment function and fit where specified. Part number 902-5402 is intended as a direct replacement coolant reservoir cap for the listed application style, with a 15 psi pressure rating and pressurized construction.