Where is the thermostat on a 04 mustang located.?

I'm traveling from Atlanta to Albany and my vehicle is running hot. My reservoir is still full so I assumed that the thermostat is inop, and I need to change it. I've changed thermostats in GM vehicles but never worked on any ford vehicles.Where is the thermostat on a 04 mustang located.?The thermostat is in the same place, where the top rad. hose connects to the engine. If you would remove your radiator cap, with a cold engine, and idle the engine till up to operating temp. you can look in the opening and see the circulation. I would have a RADIATOR SHOP check it before I did any more. NEVER replace any part till you know the problem.