What is the highest coolant temperature fellow members have seen on the volt? After a 230+ mile continuous drive on freeway mostly, mine went to 240F. Smell was toxic.
I believe you are in So Cal. Who is your dealer? It may be worth a trip to Northridge and a visit to Rydell. They are one of the largest Volt dealers in the country and have a large service department with a number of dedicated Volt techs.