2008 Dodge Avenger engine problems

I was exiting out of a parking lot in town and traffic was back up and at a standstill. As I attempted to turn left a car tried passing the stopped traffic in a no passing zone. The vehicle hit the front of my car, totaling it. The bumper was on the ground , radiator sideways, hood crinkled, fenders destroyed. My airbags did not deploy. The car that hit me was going fast and caused major damage. Taylorville police department police report number 15-341

At 51000 miles on my 2008 dodge avenger, started smelling antifreeze odor inside the car. Eventually the check engine light and electrical light indicator illuminated and the car ran extremely rough and started to run hot. Eventually engine would lose power then shut off and not be able to restart for a couple of hours. Did not appear to be losing radiator fluid. Took to the dealership and found that the thermostat housing, (made out of plastic) was cracked and it was leaking antifreeze from that point.