is it nonmale for this to happen

What is your question?

i have never had my car over heat till i had the coolant flushed then i could not drive move than 5 miles without it over heating took it back two days in a roll to the place that worked on it they gave up sent me some where else said they would pay for it i've been told it was the head gasket then i was told its the water pump and now they are saying its not their fualt because the car has 315000+ miles so they are not going to pay even tough i never had this car over heat before this