The Fiat Scudo Hasta Water Tank (Part Number 1307.RH), also compatible with the Peugeot 1307 (Expert), is a critical component of the vehicle’s cooling system, designed to manage coolant expansion and maintain system pressure. Commonly used in Fiat Scudo Hasta (2007–2016) and Peugeot Expert vans with 1.6L and 2.0L diesel engines, it stores excess coolant as temperatures rise during engine operation, preventing overflow and pressure surges. When the engine cools, the coolant is drawn back into the system, ensuring stable fluid levels and minimizing air pockets. Constructed from durable, heat-resistant plastic, the tank features a translucent body for easy visual monitoring of coolant levels and a pressure-rated cap (typically 1.0–1.4 bar) to maintain system integrity. With a capacity of approximately 1.5–2 liters, it integrates seamlessly into the engine bay via OEM-specific mounting brackets and hose connections. This tank reduces coolant evaporation, prevents overheating, and protects critical components like the radiator, water pump, and thermostat. Its corrosion-resistant design and robust fittings ensure durability in commercial and high-mileage applications, making it essential for maintaining reliable cooling performance in delivery vans and light commercial vehicles.