have a very old (I'm guessing 45 years) oil fired hot-water boiler. My problem is two radiators (not steam type) on my second floor (bedroom & bathroom) don't get hot. If I crank up the thermostat to 76 degrees, one of the radiators will get warm about ¼ of the way up (I normally keep the thermostat at 68), the other remains ice cold. There is a large radiator with an automatic bleeder on it which throws off a lot of heat in another bedroom on the second floor. I tried turning that radiator off- didn't help. The bathroom radiator with the automatic bleeder is cold. The pressure on the boiler show 20 when cold and 23 when hot. When I bleed the bedroom radiator, air comes out but no water. All radiators on the 1st floor have been bled & water comes out. Last winter, the pressure was at 10 & I had the same problems, so I put on an automatic bleeder on the bathroom radiator to no avail. Any suggestions appreciated.