Heat gauge to red line quickly upon acceleration
Never had my Edge gauge go above the mid-mark. For 2 1/2 years, never a problem driving in the Desert area. Two days in a row, the heat gauge went to 'red line' and turned off air cond., the level dropped like a rock. Message said 'coolant boiling'. Ford could not duplicate the problem. I say simple thermostat, as no leaks were found?