I was driving my 98' Cobra on a hot day and the overheating light came on when I was driving, it started to run really bad so I shut the car off and got it towed. Antifreeze came up out of the top of the tank. I don't know if there is a leak or what but the car starts and runs and idles fine, but when I turn on the air conditioning on the car chokes and dies then the overheating light comes on. Any help guys?, Thanks.