air-lock?

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i have just fitted some radiator isolating valves to my central heating system. without draining the system Heat is now turned back on and i have hot water and heat to all of my downstairs rads but the upstairs rads are stone cold yet when i turned the rad bleed key water came out immediately. I image there is an air-lock in the pipes but i have no idea how to remedy this. Can someone out there help me please,
 
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Obvious answer first have you turned new valves onif so try turning all rads off downstairs to try & move air
 

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