The Duratec uses timing chains instead of a belt, so I highly doubt those are on the way out.
The coolant light is finicky with 'Tours. The coolant level probably dipped below the sensor for a second, which caused the dash to light up. Happens all the time. The remedy is to keep the coolant level a half-inch above the MAX line.
The flashing O/D light thing happened to me a while back, never figured out what caused it. It only happened once, and it went away when I restarted the car. Maybe something with the transmission, or electrical?
Good luck.
