mario, the same exact thing happened to me when mine went. there was coolant sprayed all over the passanger side of the engine bay coming out of the overflow cap. the cap is not bad, it is your water pump. the water pumps failure lead to the coolant boiling over and spraying out of the overflow tank. i have 10 witnesses that saw this happen. then joe and i took the water pump apart and what do you know, it was all screwed up. the fins were crackd and they spun independent of the pulley.