I live in an old apartment building, in San Francisco, which has steam radiators. My radiator began banging, in the mornings, about 2 weeks ago (apx 12/14/02) and spewing a fine mist from the vent. The building manager replaced the vent. However, the banging continues. While the radiator bangs, a small trickle of water drips from the vent. The radiator bangs for about 4-5 minutes, and then stops for about 1-2 minutes, and then proceeds to bang for another 4-5 minutes. This goes on for about 2-2 1/2 hours, in the moring. It does not bang at night. Some of my neighbors are having the same problem. The building manager and the landlord have tried to correct the problem, but nothing has worked yet. Any ideas about what may be causing this problem and/or potential solutions I may suggest to the manager and the landlord? Any iformation would be extremely helpful. Thank You!