I live in an old bldg with radiators, when the heat turns on they make a loud clanging sound-how is this fixd?

Help!!! I am not getting any sleep. The landlord claims there is no way to fix the problem, but I don't believe him. Each time the heat turns on the radiators make a very loud clanging sound for 5 to 10 minutes every few hours - like someone is hitting it with a hammer. The radiator(s) do not have a... show more Help!!! I am not getting any sleep. The landlord claims there is no way to fix the problem, but I don't believe him. Each time the heat turns on the radiators make a very loud clanging sound for 5 to 10 minutes every few hours - like someone is hitting it with a hammer. The radiator(s) do not have a steam/air exit, but they do have knobs on the top. I have tried turning them to no avail.

Please help, any suggestions short of beating my landlord would be most welcomed.

Thanks,
Sleepless
7 answers 7