Womala Coolant Reservoir 31338291 Expansion Tank for Volvo XC60 S90 V90 XC90

Core Functions

• Coolant Expansion & Storage: When the engine heats up, coolant expands and flows into the reservoir; when the engine cools, contracted coolant is drawn back into the radiator. This prevents pressure buildup or coolant overflow while keeping the system fully filled.
• Air Bleeding: The reservoir’s design allows air bubbles (which reduce cooling efficiency) to rise and collect at the top, gradually escaping through the cap or dedicated vents. This maintains a “air-free” cooling system for consistent heat transfer.
• Coolant Level Monitoring: The transparent body and marked “MIN/MAX” lines let users easily check coolant levels without opening the radiator cap (safer when the engine is hot), enabling timely refills to prevent overheating.

 Compatible Vehicles

This Coolant Reservoir (OE: 31338291) is tailored for the following Volvo models and their respective year ranges:

Notes: The reservoir’s cap is often sold as an integral part (or separate accessory)—confirm if this OE number includes the cap before purchase. For 100% fitment accuracy, verify compatibility with your vehicle’s cooling system pressure rating (e.g., 1.1 bar vs. 1.4 bar) via its VIN (Vehicle Identification Number) or consult Volvo’s official service manual.

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