Yesterday my car started over heating and I saw some white smoke coming from beneath the car from the middle. When I opened the hood there was no sign of smoke but I could see the smoke coming from beneath. The smoke location seemed to be the middle. Can anyone tell me what's going on? The Raidator is full and there is a small leak in the head gasket but i change my oil every 2000 miles and make sure that it never goes under loses more than 1 quart of oil. Any suggestions? The temprature needle was lingering between 100 and 120 but when i started driving it lowered to 90.[/B]