BMW Repair: water pump 2000 740il, drain coolant, 740il

Question
steps to change the water pump?

Answer
In no particular order.....

Drain coolant

Remove hoses

Remove belt driving waterpump.

Remove thermostat.

Remove screws attaching waterpump.  You'll curse the one below the waterpump.  Make sure before you start that you can get to it, otherwise you also have to remove the lower pulley.