BMW 3 Series Coolant Expansion Tank with Cap, Level Sensor & Bleeder Screw – OEM Part No. 17137642158 / 17137609469 – Restores Proper Cooling System Pressure & Prevents Coolant Leaks | Fits BMW F30, F31 F34 GT & F35 (2011–2019)

Restore proper cooling system operation and prevent coolant leaks with this OEM-style Coolant Expansion Tank Assembly, designed for BMW F-Series models that utilize OEM Part No. 17137642158 / 17137609469.

The coolant expansion tank plays a critical role in BMW’s pressurized cooling system by managing coolant expansion and contraction as engine temperatures change. Over time, the factory plastic reservoir can become brittle due to constant heat cycles, internal pressure, and age—leading to hairline cracks, pressure loss, or sudden coolant failure.

Common symptoms of a failing expansion tank include coolant leaks, low coolant warnings, pressure-related cooling faults, overheating, or visible cracking around hose ports and seams. Because the expansion tank directly affects cooling system pressure and coolant level monitoring, timely replacement is essential to prevent engine damage.

This complete replacement assembly is manufactured to OEM fitment and pressure specifications, ensuring correct hose alignment, sensor compatibility, and mounting position. It includes the coolant reservoir, pressure cap, coolant level sensor, and bleeder screw, allowing for a full refresh of one of the most failure-prone components in BMW cooling systems.

BMW used different cooling system layouts depending on engine configuration and production date, even within the same chassis. VIN verification is strongly recommended prior to purchase to confirm correct application.

Key Features

• Direct OEM-style replacement for 17137642158 / 17137609469
• Includes expansion tank, pressure cap, level sensor, and bleeder screw
• Restores proper cooling system pressure and coolant volume
• Prevents coolant leaks and false low-coolant warnings
• Constructed from high-temperature, pressure-resistant composite materials
• Plug-and-play installation with factory mounting points

Installation Notes

• Always bleed the cooling system properly after installation
• Replace aged hoses or clamps if signs of wear are present
• Professional installation is recommended for best results

Important Fitment Notice

BMW cooling system components vary by engine, production date, and chassis configuration. VIN verification is required to ensure correct fitment and prevent return issues.

FITMENT: BMW 3 Series – F30, F31, F34, F35 (2011–2019) Including:

• 320i Sedan (F30) – N20 / N26 / B48
• 328i Sedan (F30) – N20 / N26
• 330i Sedan (F30) – B48
• 335i Sedan (F30) – N55 3.0L Turbo
• 328i Touring (F31) – N20 / N26
• 328i Gran Turismo (F34) – N20 / N26
• 320Li Sedan (F35) – N20 / B48
• 328Li Sedan (F35) – N20
• 330Li Sedan (F35) – B48

Compatible with both RWD and xDrive variants where equipped.

VIN verification required.

BAVMODS Part No: BAV0000052A

Please refer to the “Fitment” section in the product description for compatibility details.