Join Date: Aug 2005
Location: Arlington Texas
The water pump has probably failed. The pump is prone to leaking. The pump is under the timing belt cover and is driven by the smooth (non cogged) side of the timing belt. If this belt gets slick due to age, it may prevent the pump from turning.
Replace both of them and have the belt tensioner inspected during repair.
This assumes you have the 3.5, which most Visions are equipped with (at least in my experience)
If you have a 3.3, there is no timing belt and if I recall correctly, the pump is on the serpentine belt. But I could be mistaken.....
Check the coolant level.