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Thanks for all the info recieved. Hopefully it will settle itself over the next few days. Cheers! :)

Ok. If I leave this vent open, will it draw air in? I didnt have to drain the system completely, probably around a quarter. If I have to put any inhibitor in, do I pour it into the filler tank and how much? The highest rad in the house is the only one that expells air when bled and even then its...

I have changed the mid position valve on my Ideal Classic System, having drained the system to below the level on the valve, changed valve, and then refilled and bled system. All rads getting hot fine upstairs and down but when its firing up first thing in the morning, there is about 5 seconds...