In article jFRBd.10922$wu4.9627@attbi_s52, "Tom Ingle" wrote:
You probably don't have enough pressure in your boiler. Check your pressure
gauge to see how much you have. Every pound of pressure is equal to 2.31
feet. So if your highest radiators are 30 feet above the boiler then you
would need at least 13 pounds of pressure at the boiler just to raise the
water that high.

Ummmm.... isn't that what the circulating pumps are for?

i start from the top floor working my way down to the second. 3 out of
5 upstairs are really hot but i get neither air or water from them.
other 2 are luke warm - get some air but when air stops i get no water.

moving to main floor i get air from all 3 and are working fine. when
the air stops i should get water flow from the valve(?). any ideas on
this?

I imagine you're bleeding while the circulating pumps are not running. Try it
when they are.

Since air moves upward, you should bleed the *lowest* radiators first. If you
start at the top, you may have to go back and bleed the upper ones again after
the air lower in the system finds its way up to the top.