Top floor radiators hot...2nd floor radiator cold.

LI_CJ

I just had my boiler replaced with a nice Peerless unit. I have a few radiators where are notoriously tough to bleed, and I think a little bit of air re-entered the system during the boiler replacement.

I successfully bled my third floor rads, but I have one on the 2nd floor in the bathroom that is cold. I have water coming out of the bleeder (vs air), so I'm thinking there is an air pocket trapped. The feed pipe to the radiator is warm.

Should I just run water out of the bleeder until I find the remaining air? I haven't attempted to bleed more than a quart or so at one time...so maybe I need to be more aggressive and run a few gallons through.

Any other suggestions?

hot_rod

Or you may need to do a good high pressure purge again.

If there is an airlock or bubble in the piping, it may be hard to bleed that out at a radiator.

Usually there is a means to isolate and purge the various zones or loops in the boiler room. Shut off valves and purge cocks of some sort.

Does the system have a good quality air purger back at the boiler? that will take care of any air that circulates after the initial purge id performed.

LI_CJ

I'm good now. Revisited and the air worked its way through. One more purge and now I'm hot!

Thanks.