does anyone else have this problem there is always a little bit of coolent on the top and on the wheel well of my car a 96 cavalier 2.2. the cap was on there tight but coolent still comes out i guess only when i am driving what can this be?

does anyone else have this problem there is always a little bit of coolent on the top and on the wheel well of my car a 96 cavalier 2.2. the cap was on there tight but coolent still comes out i guess only when i am driving what can this be?maybe the bottle is cracked, builds up pressure when warm and forces coolant out. Maybe the cap is bad.