As I see it, your fans aren't being signalled to come on. There are 2 possiblities here. Your temp gauge or more like the temp gauge sensor is off and you are not really running that hot. The other possibility is that the sensor that sends to the engine computer is out of whack and needs to be replaced. I would try replacing both sensors and see if your engine appears to run any cooler. I know the V6 has 2 sensors and I assume the Zetec does as well, but don't quote me on that. Just look for the sensors around where the thermostat is. Hope this helps.
