I finally took my '01 Taurus, 12V, 65k for a pressure test to locate a "mysterious" coolant leak. The diagnosis was a leak below the timing chain cover. I thought maybe the water pump but no. the mechanic told me that he has seen this on other Taurus models. The cost, with a new water pump, is in the $6-$700 range. Has anyone else heard of, or experienced this problem. The coolant hasn't been neglected and it has not overheated.