I can add water over night and it will still be full in the morning. But I can only drive about a mile to a mile in a half before the water evaporates. Water has to be added after a mile of driving the water reserve thing will be empty. the overheating indicator moves to over the half way point rather quickly. Therefore I can't drive for fear of overheating and causing more damage. I have not noticed any leaking of the water or other fluids for that matter.