Ford Repair Questions? Ask a Mechanic for Answers ASAP
Check the coolant hoses going inside the firewall. right near there is a normal place for them to leak because when you turn off the panel switch you are closing off the valve in those hoses right near the firewall. it is most likely going to be a faulty heater control valve attached to those hoses
it is something you can fix at home i would think.
it is under the hood on the passenger's side