bleeding cast iron radiators

[RE]

some of my radiators are heating fine others are not. I have bled them taking buckets of water out. They still are not getting hot. What could be wrong ? After bleeding a couple of them over a two hour period some heat did come through.

[TodParticipant]

I am no expert, but I have fought the same fight. Hot water systems need to slope back toward the boiler; check radiators & pipes with a level. The slope can change as the house settles. Block up as necessary. My house uses convectors rather than radiators, and had no bleed valves. I pulled 3 or 4 fins off the 2nd floor units & installed saddle tees with 2 inch stubs of copper tubing. Most of them worked okay after burping them, but two were stubborn. I had to bleed them like bleeding a cars brakes…put length of rubber hose over the stub of tubing and submerge other end in half-full pail of water. Then just let the furnace run normally for hours or days if necessary. In my case, I was still getting an occasional bubble several hours later, and I still have to bleed that one circuit occasionally, but at least I can always get heat.: some of my radiators are heating fine others are not. I have bled them : taking buckets of water out. They still are not getting hot. What : could be wrong ? After bleeding a couple of them over : a two hour period some heat did come through.

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