Genuine OEM Jaguar Engine Coolant Tank, part number C2Z11937. This essential component stores excess engine coolant, allowing for thermal expansion and contraction while maintaining the correct fluid level and pressure within the cooling system. It is typically located in the engine bay. Constructed from durable plastic, this tank weighs approximately 1.2 kg. Using a genuine OEM coolant tank ensures proper fitment, material integrity, and resistance to temperature fluctuations and coolant chemicals, preventing leaks and system failures.