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Rushing Water Sounds in Baseboards


I have recently begun experiencing rushing water sounds when my heat turns on. I believe it is air in the system.

I have found what I believe to be the air bleeder valve for my upstairs zone. When I loosen the screw at the top of the valve, nothing happens. I have tried doing this with both the heat on and off.

I have about 12 PSI according to the gauge on the boiler. Is there something I am not doing right in order to purge the air from the system?

I have attached a few pictures of the valve. Do I need to loosen the top of the valve as well?

Thank you,

Re: Rushing Water Sounds in Baseboards

It sounds clogged. See if you can turn it with a screwdriver till it comes out. Then poke it with a piece of thin wire. Or maybe you can unthread the whole bleeder from the brass tee very slowly till you hear air coming out, then tighten it when you get water. Or depressurize the system, shut off the water fill and replace. Finally, you could do a THOH search on purge or purging and purge it with a hose at the boiler.

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