Genuine BMW Coolant Expansion Tank with Level Sensor

The Genuine BMW Coolant Expansion Tank with Level Sensor is an OEM engine coolant reservoir. It is also called a coolant overflow tank, coolant reservoir or expansion bottle. It holds excess coolant as the engine heats and cools, and it helps keep the cooling system at the correct pressure and fluid level.

Key Features:

• Genuine BMW quality: Built to BMW's original equipment specifications for fit, function and durability.
• Integrated level sensor: Monitors the coolant level and alerts the driver through the vehicle's warning system when it runs low.
• Coolant expansion and pressure management: Gives heated coolant room to expand and helps the system keep stable operating pressure.
• Durable construction: Made from heat- and chemical-resistant materials designed to withstand engine bay temperatures and long-term coolant exposure.
• Direct OEM replacement: Replaces a cracked, leaking, discolored or aged original tank.

A failing expansion tank can cause coolant loss, low-coolant warnings, pressure problems and overheating. Replacing it with a Genuine BMW part helps restore reliable cooling system performance. Each variant in this product line is a BMW OEM replacement, so choose the individual part number that matches your application.