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bleeding radiators

Posted by Josh on January 23rd, 2001 02:28 PM

I have been trying to get the air out of my hot water heating system. I have done it as prescribed in some earlier posts and it seem to be ok for a little bit, but then I begin to hear the water going through the pipes telling me that there is air in them. Sure enough, when I check some of the radiators, they will be hot at the bottom and cool on the top.
My question is this - there is a valve in the basement the apparently is the main water feed to the boiler and radiators (that's what a sign hanging on it says - I rent), should this be on at some point during the process? I usually turn it on figuring it will force the water up as I bleed the radiators. I also figure that the air has to be replaced by water. Is that right?
Thanks for any help you can give.

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