My fiat puntoSX 'M' reg is overheating can you send me a diagram of the eng?

The water in the radiator is lost and it overheats after a few minutes drive, although it doesn't break down just sounds overworked and the needle is in the red. I put in rad weld but as water was put in I noticed steam coming from the drivers side of the engine , quite low down so could it be a head gasket? I don't know the names of all the componants so a diagram with names may help. thank you