Dorman 54249 Engine Coolant Reservoir Cap

Engine Coolant Reservoir Cap Replacement

Restore a secure seal on the cooling system with this Dorman engine coolant reservoir cap, part number 54249. It is a direct replacement for a cracked, missing, or worn coolant cap and is built with a black plastic snap-on design for a clean OE-style fit.

Compatible with select Toyota 4Runner, Toyota FJ Cruiser, Lexus GX470, and Lexus GX460 applications, Dorman 54249 is sized at 42.5 mm and uses a flip-top, non-pressurized, non-vented construction.

Key Features

• Direct replacement engine coolant reservoir cap
• Black plastic construction with snap-on attachment
• Flip-top design for straightforward reservoir access
• 42.5 mm diameter for the specified applications
• Non-pressurized and non-vented design
• Fits select 2003-2017 Toyota and Lexus cooling system applications

Detailed Description

Dorman 54249 is engineered as a direct replacement coolant reservoir cap for vehicles that use a 42.5 mm snap-on cap. It is designed to replace the original cap seamlessly after damage, loss, or wear, helping maintain proper closure at the coolant reservoir. This part number 54249 is listed for 2003-2017 Toyota 4Runner, 2007-2014 Toyota FJ Cruiser, 2003-2009 Lexus GX470, and 2010-2017 Lexus GX460 applications.

This part cross-references 1640550051 for the same application.

What It Helps Solve

• Broken or cracked coolant reservoir cap
• Missing reservoir cap after service or repair
• Loose cap fit at the coolant expansion tank
• Incorrect cap size on a 42.5 mm reservoir opening
• Worn flip-top cap that no longer closes securely

Installation Notes and Tips

Verify the reservoir opening diameter before installation and confirm the cap style matches the original snap-on, flip-top design. Inspect the coolant reservoir neck for cracks or deformation before installing the new cap. For best results, install on a clean, cool engine and ensure the cap seats fully.

Quality Assurance

Dorman manufactures direct replacement parts to match original equipment fit and function for the listed applications. This coolant reservoir cap is built to the specified dimensions and design for the confirmed Toyota and Lexus fitments.