1. Thermostat: A faulty thermostat can cause your engine to run hot at idle. Check the thermostat to make sure it is opening and closing properly.
2. Water pump: A faulty water pump can also cause your engine to run hot. Check the water pump to make sure it is circulating coolant properly.
3. Radiator: A clogged or damaged radiator can restrict coolant flow and cause your engine to run hot. Check the radiator for any blockages or damage.
4. Head gasket: A blown head gasket can cause coolant to leak into the combustion chambers, which can lead to overheating. Check the head gasket for any leaks.
5. Cooling fan: A faulty cooling fan can cause your engine to run hot at idle. Check the cooling fan to make sure it is working properly.
6. Heater core: A clogged heater core can restrict coolant flow and cause your engine to run hot at idle. Check the heater core for any blockages.
I would recommend taking your Taurus to a qualified mechanic to have it diagnosed and repaired.