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It is not air it is gas. I have put a Fernox cleaner in the system would this generate gas as it disolves the limescale. Presumably the hot water is from the gas expanding and pushing the water out of the system.

would this cause hot water to re-enter the tank?

what would cause it to do this?

What if it does?

I have a vented central heating system. The pump is positioned upstairs in the airing cupboard. I can achieve good heat on speed 1, but i am getting air in my system and when i check the tank the water is hot.I am not sure if its getting warm water from the water outlet or air overflow, i think...