Genuine Volvo 30741975 Coolant Expansion Tank

The Genuine Volvo 30741975 Coolant Expansion Tank is a factory original replacement reservoir designed to maintain proper cooling system pressure and coolant levels. This OEM expansion tank serves as the reservoir that holds excess coolant and allows for thermal expansion and contraction as the engine heats up and cools down.

Key Features:

• Factory original Genuine Volvo part manufactured to OEM specifications
• Designed as the highest point in the cooling system to allow trapped air to escape
• Maintains proper cooling system pressure to prevent overheating
• Includes mounting hardware and pressure cap
• Direct replacement for proper fit and function

This expansion tank is positioned as the highest point in your Volvo's cooling system, allowing any trapped air to be pushed into the tank where it can escape while preventing air from entering when adding coolant. Failed expansion tanks can lead to loss of cooling system pressure, lowering the coolant's boiling point and causing engine overheating. Common signs of failure include steam coming from the tank, coolant dripping, or inability to maintain proper pressure.

Important Installation Note: When replacing this expansion tank, it is recommended to also replace the coolant level sensor (Volvo part number 30741155) to ensure proper compatibility and function with the new reservoir design.

Cross-Reference Part Numbers: 30723929, 8634226, 8683455, 9142716, W0133-1660981, W0133-1661302