Dorman 902-5201 Engine Coolant Reservoir Cap

Engine Coolant Reservoir Cap Replacement

Dorman 902-5201 is a direct replacement engine coolant reservoir cap for vehicles that need a precise, OE-style fit. This pressurized twist-on cap is built from black plastic and measures 63.5 mm in diameter, making it a practical choice for restoring proper coolant tank sealing on applications such as Honda Civic and Toyota Corolla service work.

Key Features

• Direct replacement engine coolant reservoir cap for a factory-style fit
• Pressurized design with a 15 psi maximum pressure rating
• Twist-on attachment type for straightforward reservoir installation
• Black plastic construction for everyday underhood use
• 63.5 mm diameter to match the specified coolant tank opening
• Part number 902-5201 for easy ordering and cross-reference

Product Details

Built to replace a cracked, missing, or worn coolant reservoir cap, Dorman 902-5201 helps restore the sealing function of the cooling system expansion tank. The cap is non-vented and does not include a pressure release lever, so it is intended for systems that use a standard pressurized twist cap design. This part cross-references Monroe Shocks & Struts (e.g., 572.2002, 0520763000) for the same application.

For buyers searching for a coolant reservoir cap for Honda Civic or Toyota Corolla, this Dorman cap provides a direct replacement option with the correct diameter and pressure rating. The 902-5201 part number is also useful when comparing replacement coolant tank caps by size and pressure specification.

Common Problems This Part Can Address

• Coolant reservoir cap cracked or broken
• Cap lost during cooling system service
• Improper sealing at the expansion tank opening
• Pressure loss at the coolant reservoir
• Visible wear on the original twist-on cap

Installation Notes and Tips

Verify the reservoir opening diameter and pressure specification before installation. Clean the tank neck and sealing surface before threading the cap into place. Confirm the cap seats fully with a secure twist-on fit, and inspect the cooling system for leaks or damage if the original cap failed due to age or overheating.

Quality Assurance

Dorman engineers this replacement cap as a direct-fit service part for the specified application. Part number 902-5201 is designed to match the original cap style and pressure requirement for dependable cooling system sealing.