Dorman 54238 Engine Coolant Reservoir Cap
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Dorman

Dorman 54238 Engine Coolant Reservoir Cap

Brand Dorman 54238
Attachment Type Threaded
Color Black
Diameter 50.5
Length (In) 2.4 in
Material Plastic
Package Contents 1 Coolant Cap
Pressure Release Lever No
Pressurized No
Type Twist
Vented Yes
Width (in) 2.4 in
Fits Mazda · 14 vehicles

Direct replacement. Precisely engineered for seamless, effective replacement of the original cap.

Threaded twist design. Provides a secure, easy-to-install fit with vented operation.

Plastic construction. Black coolant cap built for the reservoir with a non-pressurized design.

Cross-references LF5015205A for the same application. See all 1.

$32.80Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
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Step 2 — Quantity
Order total $32.80
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all Engine Coolant Reservoir Cap options

Engine Coolant Reservoir Cap Replacement

Dorman 54238 is a direct replacement engine coolant reservoir cap for vehicles that need a precise, threaded twist cap in black plastic. It is vented and built to replace a cracked, missing, or worn reservoir cap without changing the original reservoir setup.

Key Features

  • Direct replacement engine coolant reservoir cap
  • Threaded twist-on attachment for secure engagement
  • Vented design for reservoir venting
  • Black plastic construction
  • 50.5 mm diameter
  • Compact 2.4 in x 2.4 in footprint
  • Part number 54238

Detailed Description

This Dorman coolant reservoir cap is engineered as a direct-fit replacement for the original cap, helping restore proper closure at the coolant reservoir. The threaded twist design and 50.5 mm diameter support a consistent fit, while the vented construction matches the reservoir’s intended airflow path. For Mazda 3 and Mazda 3 Sport applications, this part number 54238 is also listed for washer fluid reservoir cap use on automatic transmission vehicles, making it a relevant replacement for those specific fitments.

This part cross-references Monroe Shocks & Struts (e.g., LF5015205A) for the same application.

What It Helps Solve

  • Broken or cracked reservoir cap
  • Lost coolant reservoir cap
  • Loose or poor-threading cap fit
  • Improper reservoir sealing at the cap opening
  • Replacement needs on Mazda 3 and Mazda 3 Sport automatic transmission vehicles

Installation Notes and Tips

  • Confirm the reservoir opening diameter is 50.5 mm before installation.
  • Match the threaded twist style and vented design to the original cap.
  • Verify vehicle application details for 2004-2013 Mazda 3 and 2009-2013 Mazda 3 Sport automatic transmission vehicles.
  • Inspect the reservoir neck for damage before installing the new cap.

Quality Assurance

Dorman manufactures this replacement cap to match the original style and fit requirements for the listed applications. It is a practical OE-style solution for Mazda 3 coolant reservoir cap replacement and related reservoir cap service needs.

This part fits 14 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2013Mazda3N/AFits washer fluid reservoir cap on automatic transmission vehicles.
2013Mazda3 SportN/AFits washer fluid reservoir cap on automatic transmission vehicles.
2012Mazda3N/AFits washer fluid reservoir cap on automatic transmission vehicles.
2012Mazda3 SportN/AFits washer fluid reservoir cap on automatic transmission vehicles.
2011Mazda3N/AFits washer fluid reservoir cap on automatic transmission vehicles.
2010Mazda3N/AFits washer fluid reservoir cap on automatic transmission vehicles.
2010Mazda3 SportN/AFits washer fluid reservoir cap on automatic transmission vehicles.
2009Mazda3N/AFits washer fluid reservoir cap on automatic transmission vehicles.
2009Mazda3 SportN/AFits washer fluid reservoir cap on automatic transmission vehicles.
2008Mazda3N/AFits washer fluid reservoir cap on automatic transmission vehicles.
2007Mazda3N/AFits washer fluid reservoir cap on automatic transmission vehicles.
2006Mazda3N/AFits washer fluid reservoir cap on automatic transmission vehicles.
2005Mazda3N/AFits washer fluid reservoir cap on automatic transmission vehicles.
2004Mazda3N/AFits washer fluid reservoir cap on automatic transmission vehicles.
Directly replaces or cross-references 1 part number
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
LF5015205A