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Sounds like a blown head gasket - This will damage the transmission of the SUV if the hoses where blown off the radiator . Had it happen to a car. When the gasket is blown pressure builds in the vehicles cooling system until it builds to a point where it blows the hoses off the pipes or blows up your radiator. The transmission may also have a cooling system that has been damaged from the pressure build up. Get a radiator dude to put a cap on your radiator with a pressure gauge and then run the engine and see if the pressure climbs on the cooling system.
check the connection on your battery terminal ends. if they are loose or corroded that could explain the intermittent no spark. also could be a short somewhere but id check the terminals first. I had that problem once and the car did all sorts of weird things. airbag light, check engine light, randomly wouldnt start until i would mess with the battery.
I would say your starter is faulty. Since the vehicle runs fine, and doesn't start up after being shut off until it has cooled down, it sounds more like a starter that loses contact when it is hot. You could check the starter terminals for 12 volts using a multimeter when the key is turned to Start the engine after warming up the engine and shutting it off. If 12 volts are present, replace the starter. If 12 volts are not present, check the Starter relay.
Most likely cause is going to be clogged catalytic convertors. However an ignition coil can do the same thing. If it heats up and it is going bad the coil will shut down until it can cool off. Most times it does not take that long for it to cool off enough to start again.
Check out clarks-garage.com he has a complete troubleshooting guide for your cooling system along with a schematic. In short, check the low speed resistor on the firewall. Should be around one ohm.
If fuel delivery isn't the issue then check fire. Fords of this era are famous for ignition modules acting goofy with heat. Works nice in the cold not so nice in the heat. Yes...like a Panda Bear. Change your module and you'll be off and running.
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