Gas and Oil Home Heating Furnaces - bleeding radiators

It is snowing and temps are mid 20's and dropping, the radiators on the first floor are hot (like they are supposed to be) but the 2nd floor are stone cold. We had the boiler cleaned two days ago and the service tech said if I want to bleed the radiators, I should shut the circulator pump off then open the bleeder valve until water comes out. The 2nd floor is cold, radiators are cold, I have had the bleeder valve open now for over an hour and nothing is happening. Qts: should the circulator pump be off? and should I do one room at a time?

use the search option to find the answer to this. i am not a hot water pro personally. also post in the plumbing forum. good luck

What you have to do is raise the pressure in the system. It would have been entirely appropriate for your professional service man to have checked that out for you. It would have taken him all of 10 minutes and will take you an hour. You need to find where to add water to your system and raise the pressure to about 15 psi. But FIRST, go close that bleeder. If you raise pressure and go upstairs, you will have water spraying all over the joint. If you have to manually set the pressure and have a whole lot of air in the system, you might have to go back down and add more water to get the pressure up again. Keep doing that until all 2nd floor radiators have water at the bleeder and all should be well.

If you need more detailed explanation, put detailed questions back up here and we will continue.