How much does it cost to replace a Ford Taurus cooling system

Hello, that's really odd; the 3.5L engine in this Taurus is really not known for head or head gasket failure. It would be quite unusual. Anything is certainly possible, but it's doubtful. This engine has an all aluminum block and aluminum cylinder heads, making the likelihood of heads being breached unlikely. Strongly suggest a second opinion at a shop near you. Here's a link to find some shops to consult: www.repairpal.com/repair-shops