I paid $136 for a diagnostics when I had a coolant...

I paid $136 for a diagnostics when I had a coolant smell coming through my AC system. It was diagnosed as a bad coolant reservoir. Fast forward 1.5 weeks later and my radiator cracked driving on the highway leading to overheating, a tow, $1500 worth of repairs and possibly damaged engine components that could ve been avoided had they done the quality work that I d expect from a dealership who charges that much for a diagnostics test.