Have you checked the coolant levels or the cooling fan?
Thermostat is bad
the exhaust and the seats.
your thermostat is probably broken get a new one
If it is leaking trans fluid into the coolant it can cause overheating.
more than likely the head gasket is blown or if it wont crank over the rod bearings locked up
The most likely problem is a Head Gasket. Sorry Man.
It won't cause over heating.....but it can go bad and send a signal that the engine is over heating when it is not.
Assuming that you aren't over-heating, check the fuel pump. My 1999 Taurus used to stall/ refuse to start when it was hot due to a faulty pump.
Check for an idle control problem. If the car runs when pressing lightly on the accelerator, that is your first suspect. Also check for adequate fuel pressure.
If the car is over heating or if a sound that shouldn't be there can be heard due to worn out pump bearings.
The heat shield on the engine is located on the front of the engine over the exhaust manifold. It is on top of the engine just behind the radiator.
over a blue flame