What would cause water reservoir to empty on Ford Transit Connect van?

Water reservoirs in a Ford Transit Connect van can empty due to several reasons, such as a leak in the reservoir or associated hoses, a malfunctioning water pump, or a clogged drainage system. Additionally, excessive evaporation in hot conditions or a faulty radiator could lead to coolant loss, impacting the water reservoir. Regular maintenance checks can help identify and address these issues promptly.