Genuine BMW 17-13-8-621-092 Coolant Expansion Tank with Level Sensor

The Genuine BMW Coolant Expansion Tank (Part #17-13-8-621-092) is an OEM replacement reservoir designed to maintain proper coolant system pressure and volume in your BMW vehicle. This factory-specification tank includes an integrated level sensor for accurate coolant monitoring and early warning of low fluid levels.

Key Features:

• Genuine BMW OEM part manufactured to factory specifications
• Integrated coolant level sensor for accurate monitoring
• Durable construction designed to withstand repeated thermal expansion and contraction cycles
• Direct replacement for cracked, faded, or damaged original tank
• Prevents coolant loss from damaged mounting points or broken fittings
• Maintains optimal cooling system efficiency and performance

The coolant expansion tank serves a critical function in your BMW's cooling system by providing space for coolant to expand and contract as temperatures fluctuate during normal operation. Over time, the plastic tank can become brittle from heat cycles, leading to cracks, broken nipples, or mounting point failure. Replacing a damaged expansion tank is essential to prevent coolant loss and potential engine overheating.