Peugeot 306, 2000 model

Im confused people my 306 has smoke like or steam like cumming from the heater in th ecar, and its over heating more than it should, it alse is making a steam like smear on the windsrcene which wont go away, all my levels in the engin are fine like oil water etc, have been told its the cininder head and the radeiator behind the dash board , wondering if any body can help me with this as I dont wana get ripped off in a guarage many thanks