If it is the in tank sensor then you have to get the complete coolant overflow tank and sensor assy. P/N F3LY-8A080-A listing for $79.92 and LVC cost $57.54 plus frt.
Max Zuckerberg
Parts Specialist
Five Star Ford
7100 east Mc Dowell Road
Scottsdale AZ 85257
Direct 1-800-866-1520 ext 236
Fax 1-480-949-8478
parts@fivestarford.com
You get a free sensor with every tank....Seriously the sensor is not available as a separate part.
Max