Smoke is coming from the drivers side rear as it is over heating. Why?

What is your question?

The sensor was reading it was overheating and the ca was cool to touch for over a month. Suddenly, the boiling is heard very shortly after starting the car. Strong smells of anti-freeze and white smoke coming from the right side near the wind-shield. This is no where near the water PumP, thermostat, or radiator. Its closer to the reserve. Dont see any aPParent leakage. What could this be? The hood is still cool to touch!