Q: My car will crank over but won't start. 2000 Ford Taurus

Hello - the first task is to extract whatever problem codes set the Check Engine light. These will guide diagnosis. Check next for a missing or shredded serpentine belt. If this belt failed, the alternator and water pump would no longer have power to turn them. This failure could also have been a fuel supply issue (fuel pump relay or fuel pump failure), ignition (crankshaft position sensor, coils or ignition module). I would recommend an engine stall inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs. It also sounds like you have a "borderline problem" cooling system, which needs some attention as well.