Dorman 54240 Engine Coolant Reservoir Cap

Engine Coolant Reservoir Cap for Mitsubishi Lancer

This Dorman engine coolant reservoir cap is a direct replacement for a cracked or missing original cap. Built from plastic with a snap-on, flip-top design, it restores a secure closure for the reservoir on select Mitsubishi Lancer models.

• Brand: Dorman
• Part number: 54240
• Plastic construction
• Snap-on attachment type
• Flip-top style cap
• White finish
• 32 mm diameter
• Non-pressurized and non-vented design
• Direct replacement for the original reservoir cap

Direct Replacement Details

Dorman 54240 is engineered to match the original cap’s basic form and function, making it a straightforward replacement when the factory cap is damaged, lost, or no longer sealing properly. It is listed for 2002-2006 Mitsubishi Lancer applications, with fitment noted for washer fluid reservoir cap use on automatic transmission vehicles. This part cross-references Mitsubishi OE part number MR312077 for the same application.

What It Helps Address

• Missing or broken reservoir cap
• Loose cap that no longer snaps on securely
• Reservoir opening exposed to dirt and debris
• Cap mismatch during Mitsubishi Lancer repair or service
• Replacement needs for washer fluid reservoir cap applications on automatic transmission vehicles

Installation Notes

Confirm the reservoir opening diameter before installation. This cap uses a snap-on attachment and flip-top design, so it should seat firmly by hand without special tools. Verify the application against your vehicle’s reservoir style and OE part number before ordering, especially on 2002-2006 Mitsubishi Lancer automatic transmission models.

Quality Assurance

Dorman manufactures direct replacement parts engineered to match original equipment fit and function. Part number 54240 is built to replace the factory-style reservoir cap with the specified dimensions and attachment type for the listed application.