BMW Coolant Radiator Expansion Tank Kit – Cooling System Refresh Kit – E46 X3 X5 323i 325i 328i 330i / Replaces Part Nos. 11531436408, 17137524812, 17137553919, 17117506601

Refresh your BMW’s cooling system with this radiator coolant expansion tank kit, designed to replace common failure-prone cooling components and help restore proper coolant flow, pressure control, and system reliability.

BMW cooling systems are known to become brittle over time due to repeated heat cycles, age, and pressure. A failing expansion tank, hose, cap, or coolant connector can lead to coolant leaks, overheating, low coolant warnings, pressure loss, or sudden cooling system failure. This kit is ideal for preventative maintenance or repairing an existing coolant leak on compatible BMW models.

Whether you are replacing a cracked expansion tank, refreshing old hoses, or completing a full cooling system service, this kit helps keep your BMW running at the correct operating temperature.

Key Features:

• Cooling system refresh kit for select BMW models
• Helps restore proper coolant flow and pressure control
• Ideal for replacing aging, brittle, cracked, or leaking cooling components
• Helps prevent coolant leaks, overheating, and low coolant warnings
• Great for preventative maintenance or cooling system repair
• Designed for compatible BMW E46, X3, and X5 models
• Replaces Part Nos. 11531436408, 17137524812, 17137553919, 17117506601

FITMENT: BMW 3 Series / X3 / X5

• BMW 3 Series – E46
  323i / 325i / 328i / 330i
• BMW X3
  Compatible models using this expansion tank cooling system setup
• BMW X5
  Compatible models using this expansion tank cooling system setup

Please verify your original part numbers before ordering to confirm compatibility.

Replaces Part Nos. 11531436408, 17137524812, 17137553919, 17117506601

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