Dorman 54242 Engine Coolant Reservoir Cap

Engine Coolant Reservoir Cap Replacement

Replace a cracked, missing, or worn coolant reservoir cap with a direct-fit Dorman solution built for Mitsubishi cooling system service. Dorman 54242 is a plastic, snap-on, flip-top engine coolant reservoir cap with a 35 mm diameter for a secure fit on the specified reservoir applications.

Key Features

• Direct replacement engine coolant reservoir cap for select Mitsubishi vehicles
• Plastic construction with a white finish
• Snap-on attachment with flip-top design
• 35 mm diameter for proper reservoir fitment
• Non-pressurized, non-vented design with no pressure release lever
• Formed to match the original cap profile for straightforward replacement

Detailed Product Information

Dorman 54242 is engineered as a replacement coolant reservoir cap for Mitsubishi Outlander, Mitsubishi Outlander Sport, Mitsubishi RVR, Mitsubishi Outlander PHEV, Mitsubishi Lancer, and Mitsubishi ASX applications listed below. If the original cap is cracked, lost, or no longer sealing correctly, this cap restores the reservoir closure needed for normal coolant system operation. This part cross-references Mitsubishi MR597536 for the same application.

Common Problems This Part Can Address

• Missing or broken coolant reservoir cap
• Damaged snap-on tabs or worn cap retention
• Loose reservoir closure after repeated heat cycling
• Incorrect cap size on a prior repair
• Reservoir contamination from an uncovered coolant tank

Fitment

• Fits 2016-2025 Mitsubishi Outlander Sport, N/A
• Fits 2011 Mitsubishi Outlander Sport, N/A
• Fits 2019-2025 Mitsubishi RVR, N/A
• Fits 2016-2017 Mitsubishi RVR, N/A
• Fits 2011 Mitsubishi RVR, N/A
• Fits 2019-2022 Mitsubishi Outlander PHEV, N/A
• Fits 2007-2020 Mitsubishi Outlander, N/A
• Fits 2007-2017 Mitsubishi Lancer, N/A
• Fits 2013-2015 Mitsubishi ASX, N/A
• Fits 2012-2013 Mitsubishi Outlander Sport, N/A

Installation Notes and Tips

Confirm the reservoir opening matches the 35 mm diameter before installation. Inspect the reservoir neck and sealing surface for cracks, deformation, or coolant residue, then snap the cap into place until it seats fully. For Mitsubishi Outlander Sport, Mitsubishi RVR, and Mitsubishi Outlander applications, verify the vehicle year and reservoir style against the fitment list before ordering.

Quality Assurance

Dorman manufactures direct replacement parts engineered to match original equipment form and function for the listed applications. Part number 54242 is built for consistent fitment on the specified Mitsubishi cooling system applications.