Engine Coolant Tank for BMW F20 F22 F23 F30 F31 F34 F32 F33 F36 B48 B58 Coolant Expansion Tank with Cap 17138677649 17117639020 Radiator Expansion Tank

The expansion tank, commonly known as the antifreeze reservoir or water tank, is an important component of the cooling system. It stores the coolant discharged from the engine cooling system. When the coolant temperature is high, it expands in the radiator, or when there is excess coolant, the pressure increases and releases. After the engine cools down, the excess coolant flows back to the radiator from the vehicle's expansion tank.

• Quality: Made with durable materials, it can withstand extreme temperatures and high pressures, providing reliable performance and long-lasting durability.
• Engine Protection: Effectively regulates coolant overflow and return, preventing overheating and maintaining proper coolant levels, thus extending engine life.
• Working Principle: The automotive expansion tank, also known as an antifreeze reservoir or radiator, is an important component of the cooling system. It stores coolant discharged from the engine. When the engine warms up, the coolant expands and releases excess pressure. As the engine cools down, the coolant flows back to the radiator to maintain normal engine operation.
• Easy Installation: Directly replaces original parts; easy installation without any modifications.
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