AUTO PARTS PROFESSIONAL SERIES

US Stock

Coolant Expansion Tank

Direct replacement cooling system component for stable thermal regulation.

Vehicle Compatibility

Fits select BMW 3 Series & X Series models. Please verify your vehicle information and part number before purchase.

 BMW 3 Series (E46 Body) — 1999-2006

323Ci, 323i, 325Ci, 325i, 325xi, 328Ci, 328i, 330Ci, 330i, 330xi (Includes Base, M, and Convertible trims)

BMW X3 & X5 — 2001-2010

X3 (2.5i, 3.0i, 3.0si, xDrive28i, xDrive30i), X5 (3.0i)

 Fitment Note

Compatibility is for reference only. Please ensure your current part matches the factory replacement part number or its direct aftermarket equivalent. Note: Supplied without cap.

Not sure if it fits? Send us an eBay message with your vehicle's VIN (Vehicle Identification Number) or Year/Make/Model, and our team will gladly verify compatibility for you!

 Reference Information

Replacement Part Number:

17117573781

Interchange / Partslink Number:

17137787039, 17117573781, BM3014102

 Product Overview

This coolant expansion tank is designed to replace aged, cracked, or leaking reservoirs in specified BMW vehicles. Integrated directly into the engine cooling circuit, it holds excess coolant and maintains proper system pressure as engine temperatures fluctuate.

Replacing a compromised coolant reservoir prevents overheating risks, stops coolant loss, and restores reliable thermal control for your engine.

 Key Features

1. Reliable Performance

Maintains stable coolant pressure and prevents air pockets in the cooling system.

2. Premium Material Construction

Molded from high-strength thermal-resistant plastic to withstand constant engine heat cycles.

3. Direct Replacement Design

Engineered with exact factory-style ports and mounting points for a seamless fit.

4. Extended Durability

Resistant to coolant chemical corrosion and stress cracking for long-term reliability.

Technical Specifications

Part Type

Coolant Expansion Tank

Condition

Brand New

Fitment Type

Direct Fit

Cap Included

With Cap

 What's Included

 1 × Coolant Expansion Tank

 Installation Notes

• Please verify vehicle compatibility and compare your old part number prior to installation.
• Allow the engine to cool completely before servicing the cooling system.
• Professional installation is highly recommended to ensure proper system bleeding and operation.

 Need Assistance?

If you receive a damaged item, are missing accessories, or have any installation questions, please contact us via eBay Message. Our support team is committed to assisting you and will respond within 24 hours to resolve any issues.