Water pipes expand a little when is engine fully up to temp, but when I turn sharply I get a blast of hot air in cockpit, air lock. I have bled water at inlet butterfly 4 or 5 times but I still think there is an air lock, any suggestions to move the air?

 

Drian & refill through turbo water pipe coming off the header tank

 

Thanks, will do

 

And when you refill, make sure the heater is set to hot, plus fill slowly, avoiding it gulping.
I use a funnel down that rear pipe off the header tank.