Apologies for asking this, I have had a quick search but been unable to find an answer. To bleed the cooling system, is it just as straightforward as filling the system, running for a while with the cap off with spells of increased revs? cap back on when the engine is warming and then waiting for the cooling fan to kick in? (Obviously topping the levels up as they drop before replacing the cap.) I did this yesterday, heaters were nice and hot and temp gauge getting to normal point.