How to Replace BMW 120d E87 Water Pump on N47 Engine

This video shows replacement of the water pump and the draining and replacement of the engine coolant. I replaced the pump do to a very annoying squeaking noise coming from the engine once the engine started to warmed up which made me think it may be the water pump. On investigation I found that with the drive belt removed a slight squeak could be heard when turning the pump by hand with the engine warm(this I have shown in a previous video). I believe is made a lot worse with the tension of the belt and the rotational speed of the pulley. What I have now found with the new water pump fitted is that the very loud squeak has now gone but I have noticed that at some engine temperatures there is still some sort of noise/squeak, which I think is still coming from the water pump?