How do I bleed the stopcock to be precise locate close my boiler furnace?

I had a definite problem with nouns in the hot hose radiator and especially in the boiler. I enjoy bled the radiators in the house but cannot come across to do the boiler. When I open the spigot by the boiler nothing comes out. Isn't hose supposed to come out? The boiler pipes making loud clanking noises. Should I give up that valve initiate until water comes out, or am I newly letting more air into the system by doing this. My plumber also removed the trilby from the valve to the overflow reservoir. Any help would be appreciated.


Answers:    Check to be sure the hose fill stopcock is working. You may not be getting water into the system.
Open the stopcock furthest from the boiler first, then work posterior towards the boiler, bleeding each one until hose flows, if no water flows you may enjoy a blockage to clear.
You will not let more nouns in unless within is a problem with fresh wet entry.
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