LONG, but pretty much relevant! Ok, tried a search but didn't find much pertaining to this, but maybe I just fail at searches. I was on the way to Illinois to buy a new car from a guy (a '99 Trans Am if anyone cares) and shortly after getting on the highway, the temp gauge flew up to hot and the light came on. Pulled over at a gas station, checked and filled coolant and oil. Heat remained on the high side (about 3/4ths on the gauge) but didn't move either way for the remainder of the 5 hour round trip. Afterwards, put the car in storage so I could drive the new one around. Well, March was a crazy weather month, and it snowed pretty heavily so I took the tbird out of storage because it handles significantly better in the snow. Knowing I had cooling problems, checked the coolant levels and filled to the cold fill level. Drove the car for a day, no problems, but the gauge still read on the high side (3/4ths). Next day, drove to class with it, on the way back, coolant started overflowing from the reservoir, dumping a large amount on the ground. Weather got nice, put if back in storage. Now, weathers going crazy again, so pulled it out of storage. Figured there might be air in the system so filled reservoir, and left cap open, and let car warm up. After 10-15 minutes, it starts overflowing again, leaving a huge puddle. Both times it overflowed there was a lot of white smoke and a very heavy coolant smell. I also have a loud hissing by the back of the engine (sounds like air escaping) and today I was unable to get any heat, although I think I had it the first time. I do not smell any coolant until it overflows. There also seems to be a severe lack of power (but that may just be in comparison to my new car ). I am not really sure what to do at this point in time so any help would be appreciated. Thanks for reading this and thanks for any help.