1998 Kia Sportage engine problems

Driver and passenger scalded with boiling radiator fluid with foot on pedal, had to keep foot on petal to get off road on may 30, 2013, at approx. 4:30 pm edt, I was driving my 1998 kia sportage on the garden state parkway north, just after entering the highway at exit 98 in wall, nj. The air conditioner had not been working well. The local temperature was in the high 90s, near 100 degrees. I had a passenger in the front passenger seat.

First time I brought the car back was because the engine light went on and I had a oil leakage in the engine. Car started to shake even after it was hot and made a weird noise in the engine. The motor rr window was not working and the brakes were making some weird noise. Brought to the dealer to fix and he sent it to kia for repair, the kia crew found the front caliper frozen, but the customer denied to fix it. So I brought it to a specialist to check double check the car.