Genuine BMW 17-13-9-846-642 Coolant Expansion Tank

The Genuine BMW 17-13-9-846-642 Coolant Expansion Tank is an OEM replacement reservoir designed to maintain proper coolant levels in your BMW's cooling system. This expansion tank stores excess coolant that expands when heated and supplies coolant back to the system as it cools, ensuring optimal engine temperature regulation and preventing overheating.

Key Features:

• Genuine BMW OEM part for precise fit and reliable performance
• Durable construction designed to withstand high temperatures and pressure cycles
• Integrated level sensor housing for accurate coolant monitoring
• Includes pressure cap mounting point for sealed cooling system operation
• Direct replacement for worn or cracked original expansion tank

Coolant expansion tanks can develop cracks or leaks over time due to heat cycling and pressure fluctuations. Replacing a failing expansion tank prevents coolant loss, overheating, and potential engine damage. This genuine BMW part ensures proper fitment and long-lasting durability for your vehicle's cooling system.