Overheating & Coolant flows on inside floor
A well maintained California car, but driven infrequently. It is started up weekly, but not always driven. At the gas station, after pumping gas, it wouldn't start. AAA jumped it. Drove 5 mins to my destination. Parked to let run for 15 mins more. After idling about 5- 10 mins, the car overheated, steam started fogging up front windshield, I turned the car off, and coolant began flowing onto the floor on the passenger side and flowed onto the rear floor. What is the problem and how to resolve it? What can I expect the repair cost to be if taken to a shop?