In our 80+ year old house, we recently had our bathroom renovated. To accomodate a larger vanity, we had the radiator moved down the (same) wall about 2 feet from where it originially was. Now that the bathroom is finished, the radiator will not heat up. All of the other radiators in the house will get toasty warm, but this radiator will no longer heat up. We have bled all of the radiators, including the bathroom one, 3 or more times since the radiator was moved and nothing but water comes out of the bathroom radiator - no air. But it still won't heat up. I should say that, twice, for short periods of time, it has gotten slightly warm, but only twice. We check it every day when we walk in there and it stays cold. Our contractor doesn't seem to know what the problem could be. What could be the problem?